Def gauge and dte warning
Currently have 4200km on my new f350. Loving it so far.
Have pulled a trailer for approx 3000km of the 4200. (More according to the dash, but that's another story).
I'm getting the warning that I only have 200km to empty on my def and need to fill soon. According to my guage in the dash def tank is between 1/4-1/3 full. Anybody expirience this? My 2013 would basically go 10,000 km between fills. I fill with bulk tank on the farm so not sure how much I put in.
More so curious if anyone has seen this before.
Thanks



