Quote:
Originally Posted by onewhippedpuppy
The Farm Lobby is alive and well. I like how the ethanol industry is apparently touting it as an optimal blend for fuel economy. The specific energy of ethanol is significantly less than that of gasoline, therefore the greater the percentage of ethanol in your fuel the worse your MPG. Hence why there is separate fuel economy labeling for E85, the MPG is significantly worse. My S8 gets approximately 10% better MPG when I fill up at the no-ethanol gas station, though I would use their product regardless based simply on principle. Yet another example of our government forcing an agenda on the people that is in no way beneficial to us.
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From an energy standpoint G90/E10 should have only a tiny, almost undetectable, decrease in fuel economy on a MPG basis. I too noticed a 10-15% difference when I went from California (G90/E10) to Arizona (G95/MTBE 5). My mileage on my Jeep Cherokee would go from around 15MPG highway to 17MPG highway.
The only explanation that works is that the mixture is actually closer to 3-5% water. This would reduce the mileage 10-15%, since the water absorbs the latent heat of vaporization.