I can hardly believe this myself. I have a 502 HP, 502 CI, BB in my 31 year old El Camino. I'm running a turbo 400 with a 3:31 rear axle and A/C to boot. I checked the milage this past weekend and I averaged 19.4 mpg on a 106 mile trip. This was with the A/C running and I averaged 55 mph. This was through several small towns in my neck of the woods with lots of stop and go intersections. I'm very pleased with the Ram Jet 502. I assume fuel injection is responsible for this great milage.