You guys will probably call me a liar but years ago when I move back here I drove my Hemi GTX back following my wife. She drove 55 to 60 and I never got out of the back 2 barrels. I got an honest 19mpg. I had a mild hydralic cam in it, quick advance curve in the distributer, 2" headers, 4-spd, 3.54 gears, and LR60-15's. That's the only time I ever drove it that nice, it about killed me. Dave