I'm running a slightly built 283, turbo 350 transmission and Camaro rearend with 2.73 gears. Alot of people don't believe it, but I get my best mileage at 65 mph. I get on the freeway and hold it at 65 and I get 19.5 to 20.5. I have gotten as high as 23, but I had a considerable tail wind that day, so I don't really count that. Driving 55 around here I get about 14 to 15 mpg.
