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Discussion Starter · #1 ·
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 :D
 

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Discussion Starter · #3 ·
Cool, so I don't need to buy any exspensive gas to run.

There are certain car companies that claim that their car needs the best octane level (91) to make their car run well.

So would the car then run even better if you live in a state where they sell octane #85? unfortunately california does not have this.

Thanks
 
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