The Stovebolt Site Forums The Shop Area Engine Shop 1957 6 cyl not getting proper gas mileage

I generally get pretty good mileage in my bus with the 235, about 18 or so, but I drive slow, I find that peak economy for my set up, is about 30-35 mph. Anything over that, and the milage drops.

Now, I used to have a '49 Pontiac, with a flathead six, it got 19 mpg, at 50 mph. Any faster, than that, and the mileage dropped like Keanu Reeves from an airplane.