Just did a 550 mile road trip yesterday. Two hundred and fifty miles were freeway interstate with cruise control set at 80 mph. Two hundred and fifty miles were two lane blacktop in the southwest desert (in the middle of nowhere), where the speed was quite high, including 40 straight miles at a sustained 100 mph. The other 50 miles was city driving.

Average fuel economy for the whole trip was 21 mpg.

Not bad for a 6.1 Hemi.