I consider 8mpg pretty decent. The cam is a solid roller .767/.676, 288/292@.050. Tunnel ram with 2 850 thermoquads, 4.56 gears with 31" tires. I've had a 6000 stall 8" convertor and a 10" 4000 stall in it. The mileage was the same, (I did have to drive it real nice though).Dave