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Old 12-24-2008, 01:11 PM   #25 (permalink)
cmroseberry
Mech & Aero Engineer
 
Join Date: May 2008
Location: Garland, Texas
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Concrete: Maybe the trouble you are experiencing in improving your mileage has to do with your engine being lightly loaded. The drag decrease would have decreased the engine load further. I am looking at page 90 of my old Hucho book at Specific Fuel Consumption map (fig. 3.7) that has driving resistance curves plotted on it. The figure shows how it is possible for a drag reduction to take the engine operating point further away from the region of best engine efficiency. The book suggests changing gear ratios. At this point, I am getting out of my own territory of knowledge and experience, so I will leave it to the engine and transmission experts to give you further guidance on this issue if it is indeed the problem.
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