I can't believe Ford and GM don't put gauges on these DEF tanks... thats stupid.
It seems like my DEF gauge never moves.. I have only added 2.5 Gallon in the 4,000 miles I have had the truck.
PS... Jimmy, DEF is not what is used to clean the exhaust filter. The modern systems inject fuel (diesel) into the filter to burn it clean. DEF is injected into the exhaust stream ahead of the DEF where it is used as a chemical scrubber for NOX. DEF usage is simply a percentage of fuel used... When towing you use more fuel hence more DEF used.
2014 RAM 3500 4x4 CCLB Dually, Cummins / 68RFE / 3.42 / B&W Patriot 16K
2016 Coachmen Chapparral 360IBL
SOLD - 2012 Salem Cruise Lite 281BHXL
SOLD - 2005 Dodge Ram 2500 4x4 QCLB Cummins