In article ich.edu>, Daniel J. Stern wrote:
> On Fri, 13 May 2005, Kevin Bottorff wrote:
>
>> if you add back the proper amount of fuel then no power loss is realized
>
> ...which, of course, explains why FFVs are so much doggier when driven on
> M85 than on gasoline.

Flex fuel is a compromise, that's why. It's basically a change in fuel
map and spark timing if that. The compression ratio isn't changed to take
advantage of the E85 for instance.

If an engine is set up for E85 as it's fuel, then it should have equal or
better power than an otherwise equivilent engine set up for gasoline.
Will the E85 engine consume a greater volume of fuel? Sure. Just like the
engine designed for 92 octane gasoline will consume more than the one
designed for 87 octane gasoline. But there is no reason the engine
running on 92 octane can't produce equal or greater power because the
fuel has less energy per unit volume.