Will I Get Better Fuel Mileage With Premium Gas?

May 5th, 2017 by

You pull up to the pump to fill your tank. On the sign, you see premium gas shown as if it’s the best thing since sliced bread. It makes you wonder what it actually does for you. Does it make your car run better? Does it improve your fuel mileage? What is the benefit to using premium gas?

The ‘Premium Gas’ Deception

Instead of referring to it as premium gas, a better term would be hi-octane fuel. The octane rating in premium gas is higher, and all that means is that it is a more stable-burning gasoline. But does that mean it’s better for your car? Only if it’s required.

Does My Toyota Require Premium Gas?

Currently, there aren’t any Toyota models that require hi-octane fuel. The minimum octane rating your vehicle requires is 87 octane, which is standard pump gas or regular fuel. While it’s best to use top-tier fuel from major fuel station chains, you don’t need to use premium gas for your engine to run well.

What If I Use Premium Fuel?

There’s no need to use premium fuel in your Toyota. However, if you choose to do so, there aren’t any negative reactions that will occur. Your engine will operate properly using premium fuel without any concern.

Will I See Improvement in Fuel Mileage?

There’s very little chance that you’ll notice a difference in fuel mileage. If you do notice a difference, it will be negligible at best. Your Toyota is designed to operate at peak efficiency on regular gas, which is 87 octane.

What if I use E85?

Your Toyota isn’t designed to use E85. The octane rating is below what’s necessary for the best performance from your engine. If you use E85, you will have decreased fuel efficiency, your engine may not run as well. The Check Engine light could come on also, requiring a service visit.


For the best performance and the best fuel efficiency, use the minimum octane rating as marked in your owner’s manual and on the fuel door. Using higher octane fuels, though, are of little to no benefit.

Posted in Performance