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Aug 28, 2016
Truck Year
2015 RAM 1500 Ecodiesel Bighorn with 17'' Rims and 10ply tires. This is my second fillup with DEF (at the pump) and first fillup of DEF with the entire mileage on the GDE Hottune.

First fillup I went 8166 Miles on 5.91 Gal of DEF for a MPG of 1381.

2nd fillup was 8221 miles later and required 5.83 Gal of DEF for 1424 MPG. The GDE hottune was installed 2000 miles before the first fillup. So not too bad. My oil sure is staying cleaner with the GDE.


Well-Known Member
Nov 13, 2015
DEF consumption sounds about right in line with GDE's claim:

"DEF tank refill interval always aligned with the oil change interval."