Quote:
Originally Posted by mpg_numbers_guy
If I can maintain 70-75 MPG going up a hill without losing too much speed, the coast or 125+ MPG going down the hill returns the same or slightly better fuel economy than a steady 85 MPG - 100 MPG cruise. If the car kicks out of lean burn or I have to downshift on a hill, my MPG seems to be worse, but not by much.
Now those West Virginian hills will be a challenge this Friday...
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Agreed. I would think it depends on the steepness of the hill and the excess power of the vehicle. The closer a car is to running at high load / peak BSFC RPM, the shallower the hill needed, with fuel economy maximum approaching 100% on flat terrain the lower the power of the vehicle.