can anyone that has installed ez efi or mass flo tell me what their previous mpg with carb was and what their new mpg is with efi? and maybe what they're running it with?

I never had a carb on the 350 in the El Camino, but the TPI set up is close to 20 mpg driving to work and a little more at steady freeway speeds. When run hard it drops down to 16.5 - 17 mpg.
4200 lb car
700R4
3.73 gear
driver with heavy right foot :)