Ted B. wrote:
> Over the years I've owned my current ride, I have observed that it is most
> fuel-efficient at 3500RPM, where 42MPG is easily attainable. I have also
> observed that, at 3000 RPM or less, the mileage on my vehicle drops to 35MPG
> or lower. My experience with my current vehicle is similar to several other
> vehicles I've owned. In every case, I've found that the best fuel economy
> is achieved somewhere above 70MPH. In the case of my current vehicle,
> 3500RPM in top gear equates to about 78MPH. Now I'm sure someone will state
> the obvious, which is how do I know that my tachometer and speedometer are
> accurate? I don't. But the bottom line is, in top gear, I can achieve
> BETTER fuel economy at slightly higher than normal highway speeds.
> Actually, the better fuel economy is due to slightly higher engine RPM, and
> the higher ground speed is COINCIDENTAL.

<snip>

just curious Ted, what do the power/torque curves look like for your
particular engine, and/or what engine is it? Do you have access to a
full BSFC map for your engine? Would be interesting to see.

thanks,

nate