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Old 09-05-2008, 09:37 PM   #18 (permalink)
Gregte
EcoModding Apprentice
 
Join Date: May 2008
Location: South Dakota
Posts: 117

GMC Sonoma - '94 GMC Sonoma
90 day: 36.97 mpg (US)
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Quote:
Originally Posted by Clev View Post
Trucks I agree with, but passenger vehicles are seldom geared to efficiently do their job. They're often geared to make them seem peppier or smoother. Only those marketed as fuel efficient are actually geared properly for efficiency.
Well then why don't we ecomodders raise, or lower, our final drive gear ratios by changing differential gears?

Trucks have more gears because diesels have a much more limited RPM range. And once you are up to hiway speed the only gearing that matters is your final drive gear. More gears has nothing to do with hiway driving for a car unless your terrain is so hilly that you would actually be downshifting on the hiway.
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