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Old 12-01-2014, 10:53 PM   #24 (permalink)
Grant-53
Master EcoModder
 
Join Date: Feb 2010
Location: Elmira, NY
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Best mileage I saw back in the '80s was the county highway superintendent's GMC 1/2 ton converted to a 3-51 diesel with a Clark 5 spd transmission. He got 22 mpg and carried saddle tanks for range. No aero mods.
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