MPG experiment....1976 Dart Lite

A 64 sounds pretty big. I think I had a 61-2 high precision in my 1945. Just can't remember stuff that far back! :lol:

Have you checked in with Dan about one of the economaster carbs? The booster on the economaster will deliver better economy, and signal should be better for what you are trying to do.
I was never able to clear 18mpg with my '74 Valiant with the 1945 on it, but then I was running a noodle pipe, and no long distances. The Feather Duster single would likely have bumped it up. I didn't drive the car much 'till I had the Holley 390 on it, and mileage jumped up to the low 20's with a recurve and the bigger pipe.
Of course my focus was toward the drag strip, so I tuned accordingly, and I run the A904.

Have you got a current weight for the car? I'm going to toss a wag at 3400#. I still think you should be closer to 23 mpg with the three speed, but your short travel distance is going to make it tough to get there. Shoot, is the windshield defogged by the time you get there? :-D

Keep working on it! You'll get there!

CJ