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From personal experience, I can say that I get my best gas mileage with my tuner set to 91 octane Performance tune. 87S and 93R don't do as well. Prior to getting a tuner I got my best mpg using 87 octane.

The higher the octane number the more resistant the gasoline is to combustion and therefore less prone to pre-ignition. Higher octane is generally only necessary for:

A) High compression/forced induction engines, or
B) Engines with stock internals that have the timing advanced a great deal over stock, such as you would get with a custom dyno tune, or a Bama tune etc.

The short answer is 87 without a tuner, 91-93 with a tuner.

YMMV... but this is what I experienced myself.
 

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Use the 91/93, you'll be happier in the end, less problems and issues.:good:
 

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Stock car?
Not tuned for anything higher?

If so don't waste your money on anything higher.
 

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Waste of money unless tuned....
 

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Discussion Starter #7
I filled up with 93 costed me 5 more dollars than usual but not really using less gas plan on getting a tuner
 
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