I have 20,000 miles on my 408, with the comp cams .484 lift 108 lsa cam, 10 to 1, the car has 3.23 rear gear, pump gas diet,well over 100 1/4 mile runs, I would drive that car anywhere. Averages 1.80 60" time,if I put a gear vendors unit in it and it would get better mileage than my jeep liberty.