Originally Posted by DivinDriver

From much earlier:



Ethanol is lighter (less mass per gallon) and requires almost twice as much fuel mass per air mass to be at stoich ratio.

E85 isn't pure ethanol, of course, but 85% of it is.

Since you need more more fuel mass per working charge, and your desired fuel is lower mass per unit volume than is gasoline, you end up burning a lot more gallons of ethanol to get the same amount of work as you do with gasoline.

Therefore, your cost per mile increases dramatically, and your range per tank drops significantly. You may, if set up properly, produce more net power at WOT.

The point of Thunkrd's question was about fuel cost. He can get E85 for 7% less cost per gallon, but will end up spending more on fuel because E85 is far more than 7% less efficient on a per-gallon basis.


Results from an Edmunds.com test using the same factory-prepped flex-fuel vehicle in a controlled road test, San Diego to Vegas and back:



http://www.edmunds.com/advice/altern...3/article.html

Originally Posted by PercentSevenC

No argument there. It's just that you implied that there would be no change in power in your earlier post, and my point is that if your setup is correct, even an NA engine will see a modest power bump.