DEF consumption accuracy
Ram says that the DEF tank should last for around 10,000 miles so that you can refill it at the same time as you change your oil. @AnywhereInTX says that his tank was at about a hlaf at just 1,600 miles, so something has got to give here.
I just passed the 2,500 mile mark on the odometer and the DEF gauge reads 3/4 tank. For me it's spot on. I'm 50% city & 50% highway, don't tow, and livin in CA means doing 75-80 is normal. So even with the higher revs on highway, it's pretty accurate... This post has been quiet for a while, but thought I would chime in.