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For reference on tire size to speed: On our '67 (which has 9x20 tires) when we were on the way back from recovering it, the speedo was averaging around 48-52mph on flat ground (at around 2000-2400rpm). My wife who was the chase car said that I was averaging around 50-55mph according to the...

I should add that's keeping the RPM's at safe sustained levels. Also, download a speedometer app on your phone and check it with that. These speedometers aren't the most accurate in the world.

Fuel isn't going to get you faster than that, 50-55mph is the top speed for a Deuce unless you put bigger tires on it or an OD gear in it. At that speed you're limited by gear ratios, not fuel.