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Old May 14th 05, 12:02 AM
fbloogyudsr
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"Steve" > wrote
> Brent P wrote:
>> 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.

>
> Absolutely correct.
>
>> Just like the engine designed for 92 octane gasoline will consume more
>> than the one designed for 87 octane gasoline.

>
> I disagree on that one. The difference in energy content between 87 and 92
> octane fuel is VERY tiny, and you can get so much better thermodynamic
> efficiency if you raise the compression to take advantage of 92 octane
> that the engine will probably consume LESS fuel by volume. Of course
> nobody does that, because it would still be more expensive because 92
> octane costs a lot more.


*NOT*. BMW, Mercedes, Toyota, etc., all have engines that
require 91+ octane (although they'll run w/o damage but with lower tune
due to knock sensors that cause spark retardation) to get best power
and mileage.

Floyd

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