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25 mpg UNMODIFIED!!!
My 1991 F-250 with I-6 gets 25 mpg AVERAGE. This is an average over 430 miles with 4 cold starts, city, highway, and HILLS. We made MANY stops and had a piano in the truck for 180 of those miles. Cruising speed was held at 50 mph. Tires were set at 50 lbs. This truck has NO mods. 30 mpg should be easy.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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