My two year experience with DEF fills is as follows--not really scientific but I did experience it!
NOT TOWING--about 1000 miles per gallon of DEF
TOWING-in the West--up and down passes etc. About 600 to 700 miles per gallon. I drive about 60 to 65 mph when towing. I have towed about 5000 to 6000 miles so far. The truck works great--but I tend to not sniff the exhaust!
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F-250 King Ranch Crew Cab 2012, Single Wheel, 6.7 L Diesel, Transfer Flow Internal 50 Gallon Fuel Tank, Upgraded Ford Software for 50 Gallon tank, 2006 3475Rl with Mor-ryde King Pin, 2nd AC, 2nd Battery, Pressure Pro TPMS, Wet Bolt Shackle Kit
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