> At least here in PA, we have 10% ethanol in the gas. It
> takes double the amount of ethanol than gas for the same
> amount of air. Therefore with the same metering of fuel
> (gallons per hour), the engine will be running LEAN. But you
> will have no change in the MPG!
Actually, even with optimum mixture, the MPG goes down with the ethanol
blend; basically for exactly the same reason it takes less air to burn. A
gallon of ethanol just doesn't have as much energy as a gallon of gasoline;
with the result that you should expect to burn about 5% more E10 than
straight gasoline. (Assuming of course that the change in mixture doesn't
push your engine over into lean misfire, which is a common result on 70's
vehicles with fixed-jet carburetors.)
Randall
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