[rpmerf]

1970 c20 custom camper 350 8:1 compression, slightly more aggressive cam, 3 speed 4.56 rear 235/85R16 tires

I only measured it once, but I also was leaking gas out of the gas cap so I don't know how accurate it is. It was all highway, mostly around 65, but a few times I found myself doing 75 and a few times I took it up over 90. I got about 12mpg.

A/F ratios are very important, so I plan to install a set of A/F ratio gauges one day to get it tuned in as precise as a carb from the 70's can be tuned. Another big factor that problems almost all cars is fuel atomization. Liquid fuel does not burn, only atomized fuel. There are alot of crazy ideas out there like putting a screen below your carb or tapping the intake ports to help swirl the A/F mixture better.