My 4door Falcon has a 170 [85,000 miles on it at the time] , a re-jetted 1904 144 spec. carb with an oiled cotton type air filter , generator , 3 spd , 3.10 rear gear and 175/80/13 radials set at 30 psi . On an about 250 mile mostly hwy trip with 2 persons , about 200 lbs of stuff , maintaining 60-65 mph ; it got 32.7 mpg on regular alcohol laced gas . There were no special lubricants or aerodynamic aids and a head wind and light rain part of the way . I always drive with my lights on and the radio was playing .