My '72 Daily driver, 350 260hp crate engine, th350, 31x10.5 tires. I'm getting 13-14 mpg.
The engine and tranny have been done and the axles are next. Not sure of the ratio but under 3.50. I'll find out this spring when I go through them
Sorry for the blurry pics but 2200 at 60 mph
2500 at 70 mph