On Aug 25, 10:16 am, d...@no.email.thankstospam.net (DK) wrote:
> Impreza 1993, EJ18 engine, manual.
>
> Exclusively city driving, average trip about 5-7 miles. Was trying to
> drive keeping RPMs close to 2,000 or to 3,000. For the most part
> in practice it meant choice between 4th and 3rd gear.
>
> Same pump, fuel contains "up to" 10% ethanol, same weather, two
> full tanks for each "condition". The milage was consistent between
> two tanks in each case within 0.3 MPG. Results:
>
> ~ 1,800-2,300 RPM = 26.7 MPG
> ~ 2,500-3,200 RPM = 28.1 MPG
> (No, EJ18 is not a marvel of fuel economy :-))
>
> Based on what I read before, I expected the opposite result. In any
> case, the difference is no more than 5%, so it's not really worth
> it to keep attention to. Lower RPM is less noise and less power.
> What's better for the engine in the long run?
>
> DK

I would believe this if you could average over many more, not just the
2 tanks.