Fuel Economy..?

My 71 Scamp is my daily driver. Literally the only one of my 3 cars that I really enjoy driving. Its a super six 2bbl set up with the Protronix Ignitor 2 with the Flamethrower coil electronic ignition. I get about 18mpg combined (with a heavy foot and doing 75 on the highway) i got worse gas milage when it was the 1bbl carb even with the electronic ignition. Averaged about 15mpg but i could never get it tuned right and the choke didn't open the way it should have. Also its cold where I am. Personal experience you'll get around 18 mpg (all 3 of my driver slants were right around there)