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My 96 w 3:55's went from 17 down to 13-14mpg. I cleaned the FPR screen and changed the CPS and its back up to around 17 again. May be worth a try.
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96 F350XLT 4x4 Auto 7.3 Straight 3.5 exhaust 3:55
DIY Intake, Pyro Boost Trans Gauges-Front add-a leafs, Dieselsite Coolant Filter-235,000mi. 
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