Quote:
Originally Posted by metrictundra
Ethanol will yield less mpg. Here is how it worked in my chevy flex fuel saburban. Ethanol has a higher octane rating than unleaded. You would think that it would help the power and mpg being higher octane. Wrong, the trucks computer senses higher octane and then retards the timing to compensate. there for loss of power and mpg. This mite just be the reason for some of the Toyota's getting less mpg. I live in Idaho. We do not have Ethanol yet. I burn 85 octane only and get some pretty good mpg.
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If memory serves, the higher octane would allow the engine to advance the timing. The problem is that there is less energy in one gal of ethanol than one gal of gas.