Because filling up your vehicle’s gas tank can be costly, plenty of people have advice to offer on achieving peak fuel economy. But before you take these words as gospel, make sure to do your research — there’s a good chance what you’ve heard won’t actually help you at all.

Below, we’ve debunked five myths about behaviors that supposedly improve gas mileage. Have you ever been taken in by any of these?

Gas Mileage Myths You Don’t Want to Fall For

Myth #1: Premium gas enhances fuel economy.

This myth should set off alarm bells from the first word, considering the noticeable difference in price between regular and premium fuels. If you’ve chosen to refrain from taking this advice, then you made the right choice.

Unless your vehicle is designed to benefit from premium fuel, it’s most likely a waste of your money. You can check what kind of gas your car needs in the owner’s manual.

Myth #2: Driving with your windows open always reduces gas mileage.

It’s true that running your air conditioning has a negative impact on gas mileage, which is one of the reasons you’re more likely to have worse fuel economy during the summer. A more dubious claim is that putting your windows down will also reduce your gas mileage by inhibiting your car’s aerodynamics.

Driving with your windows down does create more drag, but it’s only at highway speeds that this has a significant effect on your mileage. If you’re just driving around town and want to stay cool without running the A/C, don’t be afraid to open the windows.

Myth #3: It’s best to buy gas in the morning, while the air is still cold.

There’s a compelling reason behind this myth — gasoline is denser when it’s cooler, making it seem like it would be better to fill up your tank before the sun warms the air.

You don’t pump gas from open-air vats, though. Gasoline is stored in tanks underground, cut off from outside air temperatures. So it doesn’t matter what time of day you pump it or what the weather is like. You’re getting the same gas no matter what.

Myth #4: You need to give your engine time to warm up.

Thanks to significant advancements in engine technology, today’s engines don’t need to warm up. They do perform more efficiently at typical operating temperature, but that’s best reached by starting your car and going about your day.

Myth #5: Buying a small or compact car is the only way to achieve great gas mileage.

This is another myth where modern technology comes into play. It used to be the case that smaller was always better, but new engines, transmissions, and other features help many larger cars achieve impressive fuel economy stats that rival those of smaller cars.

Find Your New Car at Thompson Buick GMC

Want to learn more about reaching optimal gas mileage? Interested in finding a new fuel-efficient vehicle? Thompson Buick GMC can answer all of your questions, so feel free to reach out to our dealership today.