Just throwing in some other good discussions for the
archives:

Optimal speed by model (compact, mid-size, van, etc.)
http://auto.howstuffworks.com/framed...ning/speed.htm

Discussion of how resistance (especially wind resistance)
causes fuel mileage to plummet at high (55+ mph) speeds:
http://auto.howstuffworks.com/question477.htm


"ecarecar" <ecarecar@yahoo.com> wrote
>I am looking for a plot of engine speed vs. fuel
>consumption. Is one
> available anywhere? I am not at all picky about what
> specific engine.