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check to see if its leaking fuel also, check in the valley of the engine.
also if you have the factory catalytic converter, it is possible for it to be plugged, mine was plugged up pretty good at 198k compared to my truck with 84k at the time
Also keep in mind that with 4.10s if you go over 65, fuel mileage will decrease exponentially for every mph you go faster.
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2016 F450 6.7L XLT 4x4Dump, bone stock
1994 F250 7.3L XLT 4x4 ZF5 , Centurion, 4" Lift, 6637, Gulf Coast Bypass Filter, Big fuel tanks, dana 60 swap, No longer dually
1997 F350 7.3L XLT 4x4Dump, E4OD, 4 in exhaust, TS 6 position, 3/8 Trans line+external filter
2013 Scag Turf Tiger 61" 1.1L Caterpillar Diesel
1960 John Deere 440 Backhoe 2-53 detroit