Re: air - fuel ratio

Stan Weiss wrote:
> 
> jim wrote:
> >
> >
> > Not according to the EPA. They say it contains less energy than
ethanol
> > per gallon. Density might be different but doesn't matter - no one
> > purchases liquid fuel by weight.
> >
> 
> You do not purchases liquid fuel by weight. BUT A/F ratio is by weight.
> So if the specific gravity of the gas at the pump changes so does your
> A/F ratio unless something else changes.


I wasn't responding to any claim about AF ratio.
Here is what I was responding to that you snipped: 

>It requires more oxygen to burn a unit amount of MTBE than it does to
burn
>the same unit amount of ethanol, and the energy released is consequently 
>greater.

That statement doesn't specify what "unit amount" means. Ethanol is a lot
denser than MTBE so the same volume has about the same energy. According
to the EPA you will get better mileage with ethanol based reformulated gas
than MTBE based reformulated gas - not that I would endorese any of the
EPA's claims.  The point is any claims about what fuel releases what
energy should be regarded with suspicion. Simply releasing energy is not
supposed to be the object of burning trans****tation fuel.

-jim


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