On 8 Apr 2006 15:32:49 -0700, "SQ" > wrote:

>
>Well, this explains a lot. I have been driving a 5-speed and have been
>getting awful mpg in city. Now I am realizing I am shifting at very
>high rpms, around 2500.

I can't think of anything other than a large diesel engine where 2500
rpm could be considered "high" let alone "very high." If its a 4 cyl
OHC engine its just barely entering the bottom of its power band at
2500. "Very high" rpms would be more in the range 0f 7000-8000. Many
modern totally stock 4 cyl. engines can handle that with no ill
effects whatsoever.

> I will try to lower the rpms during shifting
>and see if it makes any difference.
>
>(I think one problem in my particular situation is that the type of
>engine I have derives it's power from high rpms, you have to rev it to
>get going, and I don't like it)

Then you should buy an old Lincoln or 500 cubic inch Cadillac
Eldorado. Small engines all need to rev to produce power.

FWIW automatic transmissions free-wheel under various conditions which
helps offset their gas mileage reducing attributes. Its easy to see
this if you have a tach.

Don
www.donsautomotive.com