64' C-10, rebuilt 230 w/ slight RV cam, stock 1 bbl. carb, 3 on the tree,3:73 gears and 15" tires, and I'm lucky to see 16-17mpg at Interstate speeds of 60-70 mph. Getting ready to install T-5 and that should help some. Let you know how it works out.
Tramp

dj durant

1964 Chevrolet C-10 Pickup Truck
In the Stovebolt Gallery
More pix on Flickr