Is there any difference in MPG when you use 91 vs 87 gas?

5493 Views 9 Replies 7 Participants Last post by ceric, May 11, 2005

PriusownerCAL

Discussion Starter · May 10, 2005

Is there any difference in MPG when you use 91 vs 87 gas?

I'm currently only using the 87 octane at the gas station for obvious reasons. The gas price is here in the SF Bay area around $2.51 although I got gas last week for $2.41 at Costo. I get roughly 52 MPG with freeway miles. Not bad.

Has anyone checked out to see if there's a difference between the 87 and 91 octane or perhaps the 89.

Thanks for replying. Happy Prius driving

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paul16451

· #5 · May 10, 2005

The only times I've ever used higher octane gas is on older cars that noticeably struggle and "knock" if lower octane gas is used. It made a definite, noticeable difference in my 1985 Ford Tempo and a 1983 Dodge pickup, both over 10 years old at the time I drove them.

On a Prius, you don't need the higher octane.

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