Hi Guys,
you need to buy the fuel from the same vendor, and ideally from the same station to do mileage analyses, as the octane rating has a federal allowance of an unbelievable 18% accuracy.
Note that higher octane = lower milage as octane is an efficiency inhibitor. Of course, under boost... :> 
If you want to read some great material on improving mileage in performance engines, search google for "acetone fuel additive".
http://www.pureenergysystems.com/new...00069_Acetone/
Ron
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05 GT HO, Stage 1, AGP WGA, Greddy BOV, 2 Stage WI, K&N CAI, Powder Coated Calipers, Cross-Drilled/Slotted Discs, Stainless Steel Flex Lines
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