Fuel mileage

[Kerry Pinkerton <pinkertonk@xxxxxxxxx>]

I have a question about fuel mileage.  Will running with the RPM on the 
lower side of the torque curve (about 1800 rpm) when pulling heavy (as 
in towing) be worse on mileage than shifting down so the RPM is up in 
the fatter part of the torque curve (about 2500).  At lower RPM the 
motor seems to be lugging when towing while at the higher RPM the motor 
seems more responsive and it SEEMS like my foot is not as close to the 
floor.

If I put a vacuum guage on the car will that show me the best operating 
conditions for max mileage?  Does higher vacuum = higher mileage?  This 
is one case where one of those instantaneous mileage computers would be 
handy....

Kerry
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