We hear so many different "facts" about cars, and sometimes they contradict so much, it's hard to know what's true and what isn't. So we're breaking it down.
Premium Gas Makes Standard Cars Faster: False
Many drivers believe that treating their standard sedan to premium, high-octane fuel will give it an extra boost of speed, better performance, or added horsepower. However, this is simply not true. Premium gasoline is specially formulated to resist pre-ignition in high-performance or turbocharged engines, meaning it prevents knocking in engines with high compression. If your vehicle’s owner's manual states that it requires regular unleaded fuel, using premium provides absolutely zero benefits to your vehicle's horsepower, fuel economy, or overall engine cleanliness.
It essentially amounts to pouring your hard-earned money straight down the drain. Stick to what your manufacturer recommends and save that extra cash instead.
Change Your Engine Oil Every 3,000 Miles: False
Growing up, we were all told that changing our engine oil every three thousand miles was the golden rule of vehicle maintenance. While that used to be accurate decades ago, modern automotive technology and synthetic lubricants have changed the game completely. Today, most modern passenger vehicles can easily travel between 5,000 and 7,500 miles—and sometimes even up to 15,000 miles—before needing an oil change. Relying on that old rule usually results in wasting perfectly good oil and spending money unnecessarily at the mechanic.
Always check your specific vehicle's owner's manual or follow your dashboard's oil life monitor for the most accurate timeline.
Warm Up Your Car Before Winter Driving: False
On a freezing winter morning, it feels completely natural to start your car and let it idle in the driveway for ten or fifteen minutes to warm up. While this makes the cabin nice and cozy for you, it is actually unnecessary for modern engines. Older vehicles with carburetors needed that warm-up time, but modern fuel-injected engines are fully ready to drive just thirty seconds after starting.
In fact, idling too long can actually reduce your fuel economy and leave raw fuel deposits on cylinder walls. The quickest and most efficient way to warm your engine is by driving it gently.
Red Cars Are More Expensive To Insure: False
There is a very popular rumor that driving a vibrant red vehicle will automatically skyrocket your insurance premiums because insurance companies assume you are a risky, speed-loving driver. Fortunately, this is completely untrue. Insurance companies do not care about the color of your vehicle when calculating your monthly rates. Instead, they focus heavily on important factors like your personal driving record, your age, your location, the vehicle’s make and model, its safety features, and its overall repair costs.
So, if you have your heart set on that gorgeous cherry red sedan, go ahead and buy it without any fear of extra financial penalties.
Dish Soap Is Perfect For Washing Cars: False
When your vehicle needs a quick wash on a sunny weekend afternoon, reaching for the liquid dish soap under the kitchen sink might seem like a convenient and budget-friendly idea. Unfortunately, this household habit can do serious damage to your vehicle's exterior look. Dish soap is specifically designed to strip away tough grease and food particles from your dinner plates, which means it will easily strip away the protective wax coating on your car’s paint.
Over time, using dish soap leaves your clear coat exposed to harsh UV rays and environmental damage. It is always best to buy a dedicated car wash soap instead.
Rolling Down Windows Saves More Fuel Than AC: False
The classic debate over whether to roll your windows down or blast the air conditioning to save fuel is a staple of summer road trips. The real truth depends heavily on how fast you are driving. When you are cruising around town at low speeds, keeping the windows open is indeed more efficient than running the climate control. However, once you hit the highway and accelerate past 45 miles per hour, open windows create immense aerodynamic drag.
This drag forces your engine to work much harder and consume more fuel than if you simply rolled up the windows and turned on the air conditioner.
Manual Transmissions Always Get Better Fuel Economy: False
For decades, driving a vehicle with a manual transmission was the absolute best way to squeeze extra miles out of every single gallon of fuel. While that was completely true in the past, modern automatic transmissions have evolved drastically. Today’s automatics boast advanced computers and feature seven, eight, or even ten gears, allowing them to shift far more efficiently than any human driver ever could. Continuously variable transmissions, or CVTs, are also incredibly efficient nowadays.
While driving a stick shift is still incredibly fun for car enthusiasts, it no longer gives you an automatic advantage at the fuel pump.
Electric Vehicles Catch Fire More Than Gas Cars: False
With the rise of electric vehicles on our roads, sensationalized news stories have left many drivers worried that electric vehicle batteries are prone to catching fire at any moment. Statistically speaking, this is quite inaccurate. Data from various transportation safety boards shows that conventional gasoline and hybrid vehicles are actually significantly more likely to experience a fire per 100,000 vehicles sold than fully electric cars.
Because battery fires are relatively new and unique, they naturally receive a massive amount of media coverage. Rest assured, electric vehicles must pass the exact same rigorous safety testing as traditional cars.
Overinflating Tires Will Drastically Improve Gas Mileage: False
Some drivers believe that pumping extra air into their tires beyond the recommended pressure limit decreases rolling resistance and saves fuel. While hard tires might offer a tiny, almost unnoticeable bump in fuel economy, overinflating your tires is incredibly dangerous. It severely reduces the amount of rubber touching the road, which hurts your traction and increases your stopping distance, especially on wet pavement. Furthermore, overinflated tires cause your tires to wear out prematurely in the center and create a very harsh, uncomfortable ride.
Always stick to the exact tire pressure listed on the sticker inside your driver’s door.
You Must Visit The Dealership For Maintenance: False
Many car owners mistakenly believe that they must return to the original dealership for regular maintenance, like oil changes and brake jobs, to keep their factory warranty valid. This is completely false. Thanks to federal laws, you have the absolute right to have your vehicle serviced at any independent repair shop, or even perform the maintenance yourself, without voiding your warranty. The only requirement is that the work is done properly and you keep detailed receipts and records of the services performed.
This freedom allows you to shop around for the best prices and support local mechanics.
A Quick Jump Fully Recharges Dead Batteries: False
If you accidentally leave your headlights on and wake up to a dead car battery, getting a quick jump-start from a neighbor will get your engine running again. However, many people falsely assume that driving around the block for ten minutes will fully recharge that battery back to full health. Your car’s alternator is designed to keep a healthy battery charged, not to revive a completely depleted one from scratch.
Forcing the alternator to charge a dead battery can strain it heavily. You actually need to drive for hours or connect the battery to a dedicated multi-stage battery charger.
Leaving A Pickup Tailgate Down Saves Gas: False
It seems like common sense that dropping the tailgate on a pickup truck reduces wind resistance and improves your overall fuel economy. However, automotive engineers have studied this extensively in wind tunnels and proved the exact opposite is true. When a pickup truck drives with the tailgate up, it creates a unique bubble of swirling air inside the truck bed. This trapped air bubble acts like a smooth wedge, forcing the oncoming wind to flow smoothly over the back of the truck.
Dropping the tailgate disrupts this natural bubble, creating turbulent drag that actually makes your truck consume more fuel.
Nitrogen In Tires Is Essential For Commuters: False
Many tire shops and dealerships heavily promote filling your tires with pure nitrogen rather than regular compressed air, claiming it provides massive benefits. While it is true that nitrogen leaks out of tire rubber slightly slower than regular oxygen, it is definitely not essential for everyday commuters. Regular air is already made up of about 78 percent nitrogen anyway, so using pure nitrogen is really only crucial in a few specific situations.
Unless you are driving a professional race car on a track or operating heavy commercial aircraft where extreme temperature changes occur, paying extra money for pure nitrogen filling is generally an unnecessary expense that won't make a noticeable difference.
Dirty Cars Are Actually More Fuel Efficient: False
There is a strange theory floating around the internet suggesting that a layer of dirt and mud on your vehicle acts like the dimples on a golf ball, reducing drag and improving fuel efficiency. While it sounds like a fascinating concept, science completely debunks it. Unlike the perfectly engineered dimples on a golf ball that create a smooth boundary layer of air, dirt on a vehicle is completely random and rough.
This crusty texture creates extra surface friction and turbulence, which actually hurts your fuel economy. Keeping your car clean and waxed ensures the smoothest possible airflow.
Premium Fuel Helps Prevent Harmful Engine Knocking: True
Unlike the myth that premium fuel gives regular cars a big boost, this statement is factually true. High-octane premium gasoline is specifically engineered to be much more stable under high heat and intense pressure inside an engine. In high-performance, turbocharged, or high-compression engines, regular fuel can ignite too early, causing an unsettling metallic sound known as engine knocking. Over time, severe knocking can cause catastrophic internal damage to your engine components.
If your manufacturer explicitly states that your vehicle requires premium fuel, using it is absolutely vital to protect your engine and prevent harmful knocking from occurring.
All-Wheel Drive Helps You Stop On Ice: False
Many drivers feel completely invincible during winter blizzards because their vehicle is equipped with all-wheel drive or four-wheel drive. While these systems are fantastic for providing extra traction to get your vehicle moving forward in deep snow, they do absolutely nothing to help you stop or slow down any faster on slick ice. When you press the brake pedal, all vehicles use the exact same four brakes to slow down, regardless of how many wheels are powered by the engine.
True stopping power on winter roads comes down entirely to your tires and your overall driving speed.
Cell Phones Can Explode At Gas Pumps: False
For years, gas stations have posted warning signs telling drivers to put away their cell phones while refueling, sparking a rumor that static electricity from phones can cause horrific explosions. While it is always smart to avoid distractions at the pump, there has never been a single documented case of a mobile phone sparking a fire at a gas station. The warning signs are mostly precautionary and intended to keep drivers focused on the potentially dangerous task of handling flammable fuel.
The real danger comes from getting back into your warm car, which generates static electricity.
Automatic Car Washes Always Damage Your Paint: False
Some automotive enthusiasts refuse to ever visit an automatic car wash, claiming that the rotating brushes will permanently ruin and scratch your vehicle’s beautiful paint. While older automatic washes with stiff nylon bristles certainly could leave swirl marks, modern facilities have upgraded tremendously. Today, many high-quality car washes utilize soft, closed-cell foam materials or completely touchless high-pressure water systems that gently clean without scratching your clear coat.
As long as you choose a modern, well-maintained car wash facility, you can keep your vehicle clean and shiny without worrying about damaging the exterior paint.
The Parking Brake Is Only For Hills: False
A vast majority of drivers who own vehicles with automatic transmissions only use their parking brake, also known as the emergency brake, when parking on incredibly steep hills. However, this is a bad habit that can cause issues down the road. You should actually use your parking brake every single time you park your vehicle, regardless of whether the ground is flat or sloped. Using the parking brake takes the heavy strain off a tiny metal component in your transmission called the parking pawl.
It also keeps the mechanical brake cables adjusted and prevents them from corroding.
Pouring Boiling Water Defrosts Windshields Safely: False
When you are running terribly late on a freezing morning and find your windshield covered in a thick sheet of ice, pouring boiling hot water out of a kitchen kettle seems like a brilliant, quick fix. Unfortunately, this is a recipe for an expensive disaster. Glass expands rapidly when exposed to sudden, extreme heat. Pouring boiling water onto a freezing cold windshield creates immense thermal shock that can instantly crack or completely shatter the glass right before your eyes.
It is much safer to stick with a traditional ice scraper or use your vehicle's built-in defroster system.
Synthetic Oil Causes Severe Engine Leaks: False
Back when synthetic motor oils were first introduced decades ago, they occasionally caused oil seals to shrink, which led to minor engine leaks in older cars. This historical quirk created a persistent myth that remains common today. In reality, modern synthetic oils are beautifully formulated to be fully compatible with all modern engine seals and gaskets. Switching from conventional oil to synthetic oil will absolutely not cause your engine to magically start leaking.
In fact, synthetic oils offer vastly superior protection against extreme heat and engine wear, making them an excellent choice for keeping your engine running smoothly.
Replacing All Four AWD Tires Together Is Necessary: True
If you drive a vehicle with an all-wheel-drive system and happen to get a single flat tire that cannot be repaired, you might be shocked when your mechanic tells you that you need to buy four brand new tires. While it sounds like a sales gimmick, this is factually true. All-wheel-drive systems rely on all four tires being the exact same outer diameter to function properly.
If you mix a brand new tire with three partially worn tires, the slight difference in size forces the computer system to spin the tires at different speeds, which can destroy the expensive center differential.
Putting Sugar In Gas Tanks Melts Engines: False
We have all seen movies or TV shows where a character seeks revenge by pouring a bag of white sugar directly into someone’s gas tank, allegedly melting the internal engine components completely. In reality, sugar does not dissolve in gasoline at all. Instead of melting into a sticky syrup that destroys the engine block, the sugar granules simply sit harmlessly at the bottom of the gas tank.
While it can certainly clog your fuel filters and fuel injectors, causing the engine to stall out or sputter, it will definitely not melt or destroy the mechanical structure of your engine.
Buying Gas In The Cool Morning Saves Money: False
There is a long-standing piece of advice stating that you should always buy your gasoline early in the morning when the ground is cool because fuel is denser at lower temperatures, meaning you get more gas for your dollar. While the physics behind liquid expansion is true, it does not apply to gas stations. Gasoline is stored deep underground in massive, heavily insulated storage tanks where the temperature remains incredibly stable throughout the entire day and night.
The tiny temperature variation of the fuel at the pump nozzle is so minuscule that it won't save you even a single penny.
Cruise Control Saves Fuel On Hilly Roads: False
Using your vehicle's cruise control feature is an incredible way to maintain a steady speed and save a lot of fuel when driving across long, flat stretches of highway. However, if you leave cruise control activated while driving through steep, hilly terrain, it actually has the opposite effect. Your vehicle's computer is programmed to maintain an exact speed at all costs, so it will aggressively downshift and rev the engine up high to maintain speed while climbing a hill.
A human driver can anticipate the hill, allowing the speed to drop slightly to save a significant amount of fuel.
Bigger Engines Always Burn More Fuel: False
It seems logical to assume that a smaller four-cylinder engine will always be much more fuel-efficient than a larger six-cylinder or eight-cylinder engine. However, this is not always the case in the real world. If you place a tiny, low-horsepower engine inside a heavy sport utility vehicle, that small engine has to work incredibly hard and run at high RPMs just to keep up with traffic, which burns a lot of gas.
A larger, more powerful engine can move that same heavy vehicle effortlessly at lower RPMs, often resulting in surprisingly similar or even better real-world fuel economy.
Turning Off The AC Always Saves Fuel: False
Many drivers will happily sweat through a hot summer afternoon with the windows up and the air conditioning turned off, firmly believing they are saving a fortune on fuel. While the air conditioner compressor does use some engine power, modern systems are incredibly efficient. Turning off the air conditioning only saves a noticeable amount of fuel when you are idling or driving at low neighborhood speeds.
As mentioned before, if you are driving on the highway, rolling down the windows instead of using the AC creates wind drag that hurts your mileage far more than running the air conditioner ever would.
Hands-Free Calling Is Perfectly Safe While Driving: False
With the widespread introduction of Bluetooth technology and voice commands in modern vehicles, many drivers assume that making phone calls via hands-free devices is completely safe. Unfortunately, multiple cognitive studies have proven this to be false. While hands-free devices do keep your physical hands on the steering wheel, they do not reduce the intense mental distraction of holding a conversation. Your brain still shifts its valuable focus away from the road ahead to process the phone call, creating what scientists call inattentional blindness.
Staying fully focused on driving is always the safest option for everyone.
Car Insurance Covers Everything In An Accident: False
Many vehicle owners assume that having a standard "full coverage" auto insurance policy means they are completely protected against every single expense imaginable after a major traffic accident. Sadly, this is a dangerous misconception. Standard insurance policies always have specific coverage limits and deductibles that you must pay out of pocket first. Furthermore, basic policies do not cover things like mechanical breakdowns, regular wear and tear, or the remaining balance on your auto loan if your vehicle is totaled, unless you specifically purchase extra gap insurance.
Always read your policy details carefully to avoid unpleasant surprises.
Leaving A Battery On Concrete Drains It: False
Many years ago, car battery cases were made of porous hard rubber or wood, meaning that if you placed a battery directly onto a cold, damp concrete floor, moisture could cause the electrical charge to slowly leak out into the ground. While this advice was passed down through generations, modern car batteries are safely encased in incredibly durable, non-porous polypropylene plastic. This advanced material completely insulates the internal components, meaning you can safely store a modern car battery on a concrete floor for months without any fear of it draining its power.
Just ensure it stays clean and dry.
Unlocked Cars Are Target Number One For Thieves: True
You might assume that modern car thieves are high-tech criminals who use sophisticated tools to hack into vehicles, but the reality is much simpler. Crime statistics consistently show that a vast majority of vehicle break-ins and thefts occur simply because the owner left the vehicle doors completely unlocked. Many thieves walk through parking lots or neighborhoods at night, casually pulling on door handles until they find an unlocked car.
Simply remembering to press the lock button on your key fob is still the single most effective way to protect your vehicle from being targeted by opportunistic criminals.
Pumping The Gas Pedal Starts Modern Cars: False
If you grew up driving older vehicles equipped with carburetors, you vividly remember pumping the accelerator pedal a few times to prime the engine with fuel before turning the key on a cold morning. If you try doing this in a modern vehicle, however, you are doing absolutely nothing helpful. Modern vehicles utilize advanced electronic fuel injection systems controlled by a powerful computer. The computer precisely calculates and delivers the exact amount of fuel needed to start the engine automatically.
Pumping the pedal sends no extra fuel and can occasionally confuse the electronic throttle sensor system.
Windshield Wiper Fluid Can Be Replaced By Water: False
When your windshield wiper fluid runs out, it is incredibly tempting to just fill up the plastic reservoir with plain tap water from the garden hose to save a few dollars. While water might clear off a loose layer of dust on a warm day, it is a terrible long-term replacement. Plain water lacks the specialized detergents needed to dissolve stubborn bug splatter, road grime, and tree sap.
More importantly, plain water will freeze solid during the winter, which can easily crack your fluid reservoir, destroy the pump, and leave you completely blind on icy roads.
Air Conditioning Always Saps Engine Power Drastically: False
There was a time decades ago when turning on the air conditioner would cause a small car to visibly sputter, lose power, and struggle to climb up basic hills. While that memory lingers for many drivers, modern automotive engineering has solved this problem beautifully. Today's vehicles utilize highly advanced, variable-displacement air conditioning compressors that adjust their workload based on your driving conditions.
When you accelerate hard to merge onto a busy highway, the vehicle’s computer will automatically temporarily disengage the air conditioner compressor to give you maximum engine power, making the performance loss completely unnoticeable.
Tires Should Be Replaced Based On Tread Alone: False
When inspecting tires, most drivers only check the depth of the tread using the classic penny test to see if it is time for a new set. While tread depth is incredibly important for safety, it is definitely not the only factor you should consider. Tire rubber naturally degrades and breaks down over time due to exposure to UV rays, heat, and oxygen, even if the vehicle is rarely driven.
Most tire manufacturers strongly recommend replacing any tires that are over six years old, regardless of how much tread is remaining, to prevent dangerous tire blowouts on the highway.