Everything is relative, as my dad used to say, but numbers are numbers. When my motor was new, it only got 10-13 MPG. After 1300 miles, it stopped smoking, checked timing,
and the last time I checked, it was getting 14-16 mpg. I'm planning to go to the Street Rod Nationals North on Friday in Kalamazoo, and will check the road milage. I have 255/78 15's on 8" rims which puts the tires at approx. 29 1/2". The front end has been dropped 6" from stock but the '40 Chevy Coupe is pretty boxy and not an areodynamic type vehicle. I also experimented with disconnecting the secondaries on the outer carbs so it ran on 3 primaries most of the time then the center secondary cut in when I floored it. Outcome: no difference in performance, smoother acceleration, less pedal effort(3-2's are hard) and a moderate increase in MPG.
Have fun, that's what is all about.
