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Old 03-16-2010, 11:24 AM   #2 (permalink)
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Join Date: Jun 2009
Location: Bay Area, California
Posts: 1,485

Mean Green Toaster Machine - '06 Scion xB
Team Toyota
90 day: 48.92 mpg (US)
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AFAIK, modern ECUs retard timing to prevent engine damage with lower octane fuel. I don't know why they should advance timing in anticipation of higher octane fuel. I'd have stated it differently:
Octane is the fuels resistance to knock. Using higher octane than what the engine is designed for can actually shorten the life of your wallet.
Always use the recommended octane that the engine was designed for.

Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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