Join Date: Aug 2010
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Short bed trucks have 25 gallon tanks, with about 23 gallons usable. So, your 16.5 gallon fill-up at 1/4 tank is right on the mark.
If you have the full color instrument cluster display, it has a setting for tow mode and regular (non-towing) mode for Distance to Empty (DTE) calculation. Go into the Settings menu and look for DTE calculation. I'm not sure if the truck uses your loaded/unloaded average mileage to calculate DTE, or if it has some pre-set formula for DTE. In tow mode, mine uses about 12.5 MPG for the calculation, and 17.5 MPG for the non-tow mode.
A completely full DEF tank should last 5000-8000 miles, give or take. Supposed to use more DEF while towing an under heavy load, less while cruising empty. Makes sense the DEF usage is based on how much diesel you burn.