It wasn’t even a week after the truck went in for service that I started getting the “Exhaust Fluid Range” notifications. At first, they were fairly friendly. When I started the truck, I saw “Exhaust Fluid Range 298 Miles” where the trip odometer and regular odometer usually were. I could push the check-mark button in the driver information center and get the trip info again, but the DEF range would automatically be displayed every time I restarted the truck. That was OK with me, as it was more important to know that than the fuel range — there’s a regular gauge for that, of course, and there isn’t one for the diesel exhaust fluid. We’ve heard that there may be some sort of gauge update for the DEF in the near future.