1. When your car is old
   When your car is new
2. Every time you fill up
   When your manual says to

Premium gas can easily cost 20 to 40 cents more than good old unleaded, but many drivers shell out the extra cash at the pump, believing premium is better for the car. Don't waste your money!

1. Only if you have AWD
   Only if you have rear-wheel drive
2. Yes, no matter what car you drive
   No, you can always just replace the bad one

Forget the old advice about shelling out big bucks to replace all of your tires at once. You only need to replace them all at the same time if your car has AWD, according to Consumer Reports. If you have front or rear-wheel drive, play it safe by replacing tires in pairs, but don't worry about swapping out all four at once.

1. Every 3,000 miles
   Every 5,000 to 7,500 miles
2. Every 20,000 miles
   Never, on newer cars

That whole rule about changing oil every 3,000 miles no longer holds true with most cars. You can typically wait between 5,000 and 7,500 miles, according to AAA. Of course, to do right by your car, check your manual to see what the manufacturer recommends.

1. A few seconds
   A few minutes
2. 5 minutes or more
   Until it feels warm inside

Old cars had carburetors that needed a few minutes to warm up so they could pull in the right ratio of fuel and air. Cars manufactured since the early '90s are equipped with the wonder of electronic fuel injection, which means your car only needs a few seconds to warm up.

1. When you want to go fast
   When it's all that's available
2. When your engine is supercharged
   Never

One car myth that refuses to die swears that putting jet fuel in your engine will help you max out performance and speed. Sadly, the opposite is true, and filling your tank with jet fuel will do nothing more than stall your car and ruin your day.

1. Top it off
   Squeeze the trigger only 3 more times
2. Squeeze until no more gas comes out
   Remove the nozzle and put it back on the pump

There's a really good reason that the pump automatically shuts off when your gas tank is full; it's because continuing to add gas beyond this point is seriously bad news. Topping off the tank not only wastes money, but also forces liquid gas into your vapor collector, which can lead to engine problems.

1. Let go of the wheel
   Press firmly on the brake
2. Pump the brakes
   Turn off the ignition

Old-school advice about pumping the brakes doesn't apply to modern rides with anti-lock brakes. All of that pumping just causes a car with ABS to take longer to stop. Instead, keep your foot firmly pressed on the brake, and be prepared for the pedal to pulse. That pulsing is the ABS doing its job.

1. Reduced engine power
   Reduced fuel economy
2. Difficulty steering
   There are no disadvantages.

According to AAA, a dirty air filter has no negative impact on gas mileage if you're driving a car with modern fuel injection. While a dirty air filter can cut the power of your engine, most only need to be replaced every 20,000 miles or so (though you should always check your manual to make sure).

1. The dirty one
   The clean one
2. The mileage will be the same.
   It depends on wind speed.

Believe it or not, "MythBusters" actually took on the clean vs. dirty debate in episode 137 of the show. They found that at highway speeds, dirt on the car cuts fuel economy by around 10 percent. That means you can reduce the pain at the pump with a bucket of sudsy water and some elbow grease.

1. 10 seconds
   1 minute
2. 5 minutes
   30 minutes

Want to improve fuel economy and reduce your impact on the earth? Turn off your engine any time you have to idle your car for 10 seconds or more. After 10 seconds of idling, it's more efficient and cost-effective to turn off the car and switch it back on when you're ready to drive again.

1. Drive slowly for the day.
   Keep car off and drain gas tank.
2. Top off the gas with diesel.
   Add some water to the tank.

In the U.S., most diesel nozzles aren't designed to fit into a gas tank, but some drivers manage to find a way to accidentally fuel up their gas-powered car with diesel. If this happens, the best way to save your car from disaster is to keep your car turned off and have the tank drained.

1. Pretty much nothing
   10 percent
2. 25 percent
   50 percent

Those rumors about filling up your tank early in the morning to save money aren't rooted in reality, according to Consumer Reports. Thanks to double-walled underground storage tanks at the gas station, fuel stays the same temperature regardless of what the thermometer in your car is saying.

1. Leave it open.
   Remove it entirely.
2. Keep it closed.
   Replace it with a cargo net.

No, opening your tailgate before you hit the road won't save on gas. According to MythBusters, keeping the tailgate closed creates a separate airflow area in the truck's bed. In a test of two identical, trucks, the show's hosts found that a truck with the tailgate up traveled 30 miles further.

1. Cars built after 2000
   Cars built before 2000
2. All cars need tuneups
   No cars need tuneups

Cars built before the year 2000 require regular tuneups to adjust things like the carburetor, condenser and spark plugs. Modern cars use new technology, including spark plugs that can last 100,000 miles or more, and don't benefit from routine tuneups, according to Consumer Reports.

1. Very little
   10 percent
2. 25 percent
   75 percent

Fueleconomy.gov estimates that switching on the AC cuts fuel economy by around 25 percent. An experiment by the MythBusters team found that driving with the windows down wastes much less fuel than switching on the AC when traveling at 45 mph.

1. Bigger selection of cars
   Better acceleration
2. Improved fuel economy
   Cheaper purchase price

If you can manage a stick shift, this technology offers a lot of advantages over an automatic, from improved acceleration to better fuel economy to a cheaper sticker price on average. You'll find less variety, and may have some resale difficulties.

1. Fuel line devices
   Water-to-fuel devices
2. Mixture enhancers
   None of these

Both the EPA and the Federal Trade Commission warn that after-market gas-saving or emissions-reducing products don't work, and many actually reduce fuel economy or increase pollution from your ride. The EPA states that of all the devices it has tested, none have worked.

1. Steer away from the skid.
   Remove keys from ignition.
2. Press hard on the gas.
   Look where you want the car to go.

The old adage to steer into a skid has been replaced with new advice. To free yourself from the skid, keep your eyes pointed in the direction you want to travel while also removing your foot from the gas. This should help you regain control and keep both you and your car safe.

1. Ruin engine
   Clog pistons
2. Poor fuel economy
   Nothing

All gas starts off the same at the refinery before required EPA additives are mixed in. Many brands then add there own additives, but there are mixed reports about whether these proprietary additives actually help your car.

1. Shortens tire life
   Reduces safety
2. Cuts fuel economy
   All of the above

It's hard to believe that a little air can make such a difference, but under-inflating your tires not only shortens their lives and makes you less safe on the road, but can also cut fuel economy. In fact, Fueleconomy.gov estimates that you can improve mileage by 0.6% simply by properly inflatng your tires.

1. Fill your tank like normal.
   Come back the next day.
2. Add stabilizer to your tank.
   Use diesel instead.

One car myth warns drivers that tankers stir up dirt and sludge when they fill the underground tanks at gas stations. While this is true, Snopes.com reassures drivers that it shouldn't stop you from filling up. Between the fuel filters in your car and the filters required at gas stations in the U.S., this extra debris can't harm your car.

1. Ignition
   Engine
2. Shifter
   Steering wheel

Believe it or not, putting your car key on an overloaded key chain can put so much stress on your ignition that it could eventually keep your car from starting properly. In 2014, GM recalled nearly 800,000 cars because of an ignition issue that could be set off by factors which included a heavy key chain.

1. Fill the gas tank
   Clean the undercarriage
2. Fill tires to high end of recommended range
   All of the above.

To keep your care in top shape when it's in storage, you must take some steps to prepare it first. This includes filling it with gas, topping off the fluids, cleaning any gunk off of the undercarriage and filling the tires.

1. When you want to save on gas
   When putting the car in storage
2. When you have an oil leak
   On very cold days

A blocked tailpipe is a major damage to your health and to your car, but it often makes sense to stuff the tailpipe shut with a rag or steel wool when you're storing your vehicle. This prevents critters from getting into the car and building a home. Of course, it's critical to remove the blockage before you start the car again.

1. When you're out of washer fluid
   If you live in a hot climate
2. When you have a newer car
   Never

Windshield wiper fluid is made of solvents and antifreeze. Adding water in place of this special fluid will not only put you at risk for frozen tubes, hoses and tanks, but is also associated with a risk of Legionnaire's disease. Stay safe and stick to washer fluid.

1. Prevent air leaks
   Keep dirt and grease out of valve
2. Aesthetics
   All of these

Those valve caps on your tires might not look like much, and many are tempted to forget about them if one gets lost or broken. Keeping these caps in place not only reduces air leaks and keeps your ride looking polished and together, but also keeps out grime and dirt.

1. Key
   Phone
2. Penny
   Pencil

The DOT requires you to replace tires with a tread depth of less than 2/32 of an inch. If you can stick a penny between the treads with the top of Lincoln's head facing down, and his head disappears behind the treads, your tires are still safe to use. If the top of his head is visible, it's time for new tires.

1. Never
   When your car has ABS
2. If you are out of brake fluid
   When your car is more than 20 years old

They may all go by the name fluid, but the liquids used in your brakes are very different from those used in your engine, transmission or power steering. Almost all car fluids are oil-based, while brake fluid is alcohol-based to help control excess moisture in brake lines.

1. Temperature
   Viscosity
2. Quality
   Price

The numbers you see on oil refers to the viscosity, or thickness. Every car is designed to work best with a specific oil viscosity, so always check the cap on your oil tank, or your car manual, to choose the right oil for your ride.

1. Combine trips.
   Park in a garage.
2. Keep seat warmers off.
   Give your car several minutes to warm up.

Fuel economy is 12 to 22 percent lower in the winter than in the summer. To save stress on your car and keep fuel costs low, try to combine trips, park in a garage to keep your car warm and keep extras like seat warmers turned off. Idling is a major waste of gas.

1. Water
   Gasoline
2. Oil
   Salt

Antifreeze is a critical fluid for maintaining a healthy engine, but shouldn't be used alone. It must be mixed with water in a 50/50 ratio before adding it to the car. Some antifreeze products are already diluted, so always check the label to be sure.

1. No break-in period necessary
   500 to 1,000 miles
2. 10,000 miles
   50,000 miles

The first 500 to 1,000 miles of driving in a new car is considered the break-in period. Avoid revving your engine, towing, extreme speeds and hard stops during this period to maximize the life of your engine and related systems.

1. Disaster
   Nothing
2. It depends on your car.
   It depends on the temperature.

There are two kinds of coolant, including orange Dexcool and the older green ethylene glycol. Mixing these varieties in your engine creates a gel that hardens in the engine, grinding your car to a halt.

1. Prevent seals from drying out
   Reduce risk of mold
2. Ensure lubrication
   All of these

No matter how cold it is where you live, it's good for your air conditioning system if you turn it on every few weeks throughout the winter. This ensures the system stays lubricated, keeps seals from drying out and reduces mold and moisture in the lines.

1. 3,000 miles
   5,000 miles
2. 20,000 miles
   No rotation necessary

Tire rotation ensures even wear and reliable traction, keeping you safer on the road. Bridgestone recommends rotating tires every 5,000 miles, though it's always a good idea to check your manual to see what the manufacturer suggests.