[Diy_efi] Is E85 worth it? Speed factor?

[Joseph Obernberger]

Up to a point - I mean, you certainly don't get the best gas mileage at 
0 MPH!  There is some speed where a vehicle (probably different for 
every vehicle) gets the best gas mileage.  I would at least expect it to 
be in the top gear, and probably at a speed where the throttle is open 
enough to minimize pumping loss, and at the same time maintain closed 
loop operation.
Somehow I doubt it's 55MPH - probably significantly faster for most 
modern cars.  The whole idea of reducing the speed limit to increase 
fuel economy is bogus.

Joe
http://www.lovehorsepower.com


Ernest Buckler wrote:
>
> ----- Original Message ----- >> I haven't seen anyone put SPEED into 
> this set of
>>> equations yet: If we average 90 mph instead of 60
>>> mph, we instantly reduce the average TIME of
>>> emissions by 1/3.  If mpg did not drop by 1/3, the
>>> difference is a net gain in reduced emissions.
>>
>> Sorry, your math is wrong.  :)  We covered the same
>> distance, and used the same amount of gas doing so;
>> therefore, the emissions are the same.  If you go
>> faster, you just produce them more quickly.
>>
>> If what you said was in fact the case, we'd use less
>> and less gas per mile the faster we went.  I can
>> personally attest that this is, sadly, not the case.  ;)
>>
> Dang, so I STILL don't have a good excuse for speeding...sigh.
> Ernie
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