Just filled up the tank with 91 octane premium fuel

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Originally Posted by Aothachos

+2 lol i used to get 60 miles before the first bar went, now i use 91 it goes up to 75-80 on the first bar =)

So you're saying that running 91 octane in lieu of 87 octane increases fuel economy by about 30%..

Wouldn't Toyota simply recommend premium if that were the case? Premium only costs roughly 10% more, yet according to you it improves fuel economy by 30%. That means that running premium is a FAR more economical choice than running regular.

Honestly, anyone can claim anything on these forums. The fact of the matter is that I hold a mechanical engineering degree, have been employed in the profession for 23 years and have read quite a bit about the combustion process and fuel.

Scientifically speaking, your claim is baseless.