'96 supercab, 5 spd manual, 3.73 rear. I used to get between 20 and 21 MPG. Mostly highway I commute 30 miles round trip everyday. My truck has the 19 gallon tank and I would routinely see over 400 MPT (between 425 and 440). I just put some 30 inch rubber on it though and my gas mileage went buh bye, I guestimate I lost around 60 to 70 MPT. I am hopeful that putting 4.10 gears in it will bring it back up closer to what I am used to. Because gas doesn't seem to be getting any cheaper and I would hate to have to change back to the old tires and rims because I can't afford to feed it.