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Old 02-14-2013, 10:32 PM
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JDGlandscape JDGlandscape is offline
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Join Date: Feb 2012
Location: New Hampshire
Posts: 415
I think you may have some problems with your 1999 7.3.. or maybe you are always slamming the petal. But i have two 99 f350s a pickup and a dump and the pickup pulling my trailer loaded up to 5500 pounds gets between 13-16 all day everyday with that weight. There are lots of things to look at for a decrease in mileage on these things.. that being said, i get 9or 10 with my 5.4 and when i borrowed a 6.0 chevy 2500 i got 8.5-10.
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