Gas mileage is a strange thing. I had a 1998 Dodge Ram Quad Cab 4x4 with the 318, 5.2L, that got 13-14 mpg, now I have a 1999 version of the same truck, but with the 360, 5.9L. It has almost 200k on it, and it gets 17-18 mpg!! I'm not complaining about that!!