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Old 08-01-2013, 03:40 PM
spp spp is offline
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Apples and oranges I know but I had a 99 F250 7.3 and went from the stock bumper to a full FRU with bull bar and such around 120k miles. I think the weight was close to 300-400lbs. It dropped by 1-2 mpg (21 hwy down to 19).

Weight is one factor but the aerodynamics are another. If you go from the smooth rounded front end to the slab cast iron, the aero penalty may be a bigger factor than the weight.
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