I had a 6.2 and it averaged around 12-14 MPG. Had the big trans and breaks but definitely did not have the power of my 6.7 diesel of course. It was an awesome truck until I had transmission issues and it was never the same so I sold it. If I did not have those issues I would still have it. Went back to a half ton but may revisit in the future. My buddy has the big 7.3 Godzilla and not sure I would want one.
