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I was able to touch 42 mpg with the 3800 in the olds, and the sunfire will be a good 800 lbs lighter. The gearing is almost identical. The sunfire would always downshift on hills and the 3800 hardly ever downshifted.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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