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I lowered a 1978 Mercury Zepher 1" and saw no difference in fuel mileage and experienced all the annoying scraping and bottoming problems described by others here. I raised a 1986 Ford E350 diesel van 2" and included about 400 lbs of fulltime 4wd transfercase and front drive axle and only lowered the 55mph fuel mileage 2mpg from 24mpg(imp) to 22mpg(imp). Raising the van another inch had no measurable effect on fuel mileage.
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