mich800 wrote:
I think you will find most of the mfg's are going with DEF tanks that get you to the range of an average oil change give or take.
So far my 2015 Ram has gone through approximately 7 gallons in the first 5200 miles. The tank only holds 5 and a half gallons. Based on the EVIC's current estimation of oil life I'll go through more than two tanks before it's due and oil change. That said, the DEF consumption really seems to vary based on how hard you're pulling so that will most likely make a huge difference in consumption, pretty much in line with gas mileage.