>>315987>5.7L hemi>4.56 diffs>34 gallon tanku wot
although I get 10mpg with 7k lbs behind it through the mountains, and it still pulls/stops the trailer well, which is nice. It'd be nice to get more than 13 unloaded though. But sweet $DEITY the torque that truck puts to the ground...
Both my old 5.9L half-tons could get 18mpg highway unloaded.