Without a head wind, running ~57-60mph, mostly empty bed, I'm doing about 22-23 mpg on the highway. Depending on the severity of the head wind, I'm around 19 highway. Most trips are WI to mid IN.

Currently, I'm not getting Chit- truck appears to be down with head gasket issue. 400,700 on the odometer. Sure would like to upgrade to something newer, but a drop in fuel mileage would blow....

What's funny is watching the 50 mile average fuel economy with my Edge monitor plugged into the diagnostic port. Going through Chicago (I-94/I-294 with the sound barriers/trees/buildings blocking most wind), the Edge reported as much as 50 mpg! Bite me! Calculated value and not real, I realize. Still amuzing to watch.