samhain7ExplorerNov 19, 2020Ram 2500 DEF fluidHi all I am on tank of gas # 6 on my new to me truck and thrnDEF fluid gage has barely even moved How long do you get on a tank of DEF fluid and how big is the reservoir? ThanksShow More
ACZLExplorerNov 19, 2020As already stated, it varies a lot (towing VS not towing), but in general, you will only fill the DEF 1-2x/yr.