[p38fln]

I wanted to add this - the EPA estimate for the truck is 17 city / 21 highway. So far, i don't think anyone has ever managed to hit either estimate, or come even remotely close during normal driving.

I think its problem is weight - it weighs almost 5,700 pounds with a driver and full tank of gas. On flat ground I'm sure its capable of those numbers, and it's instantaneous fuel economy seems to reflect that, but even the slightest hill I can hear the turbos spool up and watch the avg fuel economy line start to drop. It's got enough power that you never notice what's happening - the torque converter will stay locked in even on a 8% to 9% grade and all you hear is the whine of the turbos and a deeper exhaust note.

It has a nice fuel economy display, a large bar graph that moves up and down with the instant fuel economy and a white line in the middle of the graph that shows the average since last reset - seems to be dead on accurate to hand calculations as well.