Challenge: find one independent website that states higher octane fuel improves mileage. It doesn’t. This, from a Toyota dealer, is typical of the online consensus on this topic:
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Will I Get Better Fuel Mileage With Premium Gas?
May 5th, 2017 by Toyota of West County
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.
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Your trucks, your bucks, but objectively, buying premium is a waste.