Jason you know my thoughts. My last 3 new trucks have been chevy. 05, 08, and now a 2010. I must say that the new model half tons are really nice to pull a boat with. Especially since they put the 6new speed allison transmission in it. Its a towing machine.
2010 chevy silverado z-71, 4x4, crewcab. The best I have did is 402 miles on a full tank with no load and about 305 to 320 on a full tank pulling boat.
Eric