If he's getting 12 in town in a ram van he's doing great. Best I ever got with one of these was 18.5mpg doing 55mph on the interstate in the flatlands of north dakota with the cruise set and no load in a 97 ram 1500. 70+mph dopped me to 12mpg. Sounds like there's nothing wrong with his to me. I agree with dogdays that the worst thing you can do is to start monkeying with it to try to fix a problem that doesn't exist.