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Old 01-22-2013, 05:18 PM
LawnSite Bronze Member
Join Date: Mar 2003
Location: Maine
Posts: 1,145
Andrew on the F550 the motors are detuned because of the extra weight that it can haul which makes the mpg lower, thats what i was told by my Ford service tech. I have never been able to break 10mpg in my 08 f550.

My 10' f350 mpg has gone down but I think the dpf needs to be cleaned but I have a way around that!
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