You guys pretty much put the final nail in the coffin! I think the dodge and chevy guys are bluffers, empty yes they are right loaded nope, I jus got done taking my uncles 06 duramax 2500 crew cab on a 500 mile round trip and i averaged 17.4 mpg empty driving 70-75 all interstate. And it has aftermarket exhaust, intake, and a edge products programmer.