I got 11.7 MPG with the old 235 and the rather short, original 4.57 rear end of my 3/4T.

I haven't measured it with the 261 and 4.10 rear end.

1948 3/4-Ton 5-Window Flatbed Chevrolet

34 Years. Now with a '61 261, 848 head, Rochester Monojet carb, SM420 4-speed, 4.10 rear, dual reservoir MC, Bendix up front, 235/85R16 tires, 12-volt w/alternator, electric wipers and a modern radio in the glove box.