When I picked up my 1964 GMC 4000 with 305 V6 I averaged 9.9mpg at 50-55mph and 10.1 at 45-50mph during the 480 mile drive home, all highway and state routes. Truck weighed about 10,000 with an empty 1200 gallon tank bed then. It now weighs 7900 with a 12' flatbed. I haven't checked in-town mileage but it is probably 5-6.
Last edited by ScottGMC40001964; 05/01/2013 9:35 PM.
