51 Chevy pickup, 273 gears (70 olds rear)mustang II front, 700r4 & 4.3v6 TBI
consistently get 22 to 23 mpg, runs 2400 to 2600 rpms at 60 mph (depending on the lie of the land)
lots of power to cruise. Very happy with this set up. Kept everything else stock.
Since I can all but guarantee you're not running 18" diameter tires something there is wrong. There is no way you would be running 2400-2600 RPM at 60MPH with a 2.73 and 700R4 in overdrive. With that setup your 4.3 would lug like crazy at 60MPH. Something there is off. What's you actual gear ratio and tire size?
With those parameters you would be running at most 1500RPM at 60MPH, assuming a 26" tire.
