I use an '02 van with a 5.7, a quad in the van, pulling my 28' toy hauler full with a tracker and 2 quads only get like 6-7mpg
I think it needs a tuneup and that's horrible mileage, but I guess if I'm only gonna be getting 12-14mpg anyays with a diesel then I guess I should just be happy i'm not making payments on one