[67c10rustbuket]

Cool lookin first truck man! Your gas mileage should be between 10-20 mpg. OK really though it depends alot of the build of the motor, the transmission OD (overdrive) or not, rear end gear, overall tire diameter, weight of the vihicle, how many times you floor it per hour. and so on... first I would look at the pan on the transmission and figure out which trans you have, either TH350 TH400 or newer swapped 700R4 (OD). you can google chevy trans ID to compare the pan to identify yours. I think 16-18 is pretty common with an overdrive trans and 12-14 without overdrive. thats what i have had in my many chevy trucks anyway. cant wait to see more.