My '64 1/2 ton gets 16 MPG w/350/700R4 Q-jet 3.42 gears. I had a '90 EFI C2500 had 350/TH400 all it would get was 13MPG. I feel Overdrive will help mileage more than anything. My 1st boss said there were 3 thing a man would lie about, 1-how much money he made,2-his sex life,3-his gas mileage. Brian
