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Tony my TV is a F-350 DRW with the 6.7 diesel. What I have read is the DEF usage drops on the Ford when towing/working the engine hard as it is doing a sort of regeneration because of the higher exhaust temperatures. Driving empty it regenerates more than when I tow especially if I am babying it. I try to drive it like I stole it a bit now driving solo and I have less regenerations. I can lose a little MPG driving it like I stole it or lose MPG when it does a 15-25 minute regeneration.
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