84 k20 + 383 stroker+ 4x4+6 inch lift+ led foot = 6-8 MPG
my buddies 454
gets horrible mpg, higher the RPMs and you can actually watch the gas guage drop
The best MPG in a truck that can still pull a trailer and move is a 12 valve cummins and a 5 speed, My grandpa had one and we'd get like 25+ MPG,,