Tune for fuel mileage?
My dad has an 03 6.0 with 80k and beleive it or not its has never been in the shop for anything except maintenance. It is a 2wd with 235/85/16's. He is currently running a 1704 Superchips on the economy setting. He sees 18mpgs right now at about 25%hwy/75%city driving.
I am trying to sell him my SCT and want to know who can write me a fuel mileage tune? He doesn't care if its fast or not; he never gets on it.
Also, what kind of mileage could we potentially see out of such a tune?