Will, my 78 C-20 350 with th400 and 4:11 gear gets about 10 mpg. It does not matter if it is up hill down hill loaded or empty. Looking to change to a 3:73 gear to improve mileage.
"If it ain't Steel it ain't Real" "Earth the insane aslyum for the rest of the Universe" 41 1/2-ton, a work in progress 68 Shortbed stepside 327/325hp/700R4
