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Our 3500 uses 5 gallons of DEF in 2000 miles, almost exactly, when towing. I get an honest 10 MPG towing. Sometimes downhill or tailwind, it does better. A real feel good moment at the pump. I don't use the dash calculation, I calculate each tank manually.
I couldnt be happier with the mileage. My only gripe is that the truck does great on regens towing, passive regens are great. My gripe is as soon as i disconnect and go sight seeing it almost Immediately goes into regen. The dealer has looked at it numerous times and says all is okay. Around town regens are numerous.
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2021 GMC 3500HD Dually
2019 3790RD Legacy
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