With $4 gas, what do you get for mileage??????

Maybe 200 miles on it now and just did a 50 mile jaunt and on a 500+ horse 440 in a 73 duster i was amazed. I'd cruise at 55 or so then hammer down on it and run it to 3500 rpm then back off. Back and forth. I filled up before i left and filled up when i returned and it took 3.66 gal. By my figures that comes out to 13.66 MPG. One half 110 and the other half premium. I'm VERY satisfied.