heck, i have a 4dr and a 2dr yukon, they are both the slowest hear and the 2 dr gets 10 mpg but i did get 17mpg in the vortec power 4dr just wait though, the first new 6.2l active fuel engine that goes bad just might end up in one of my rigs, then i'll have 385hp and 22mpg...shhhh....dont tell my boss....