mpg single vs super six

Lots of things to factor in here. The 2bbl is going to require less throttle to get you to the same point as the 1bbl.But,if you have your foot in it all the time the 2bbl has the ability to get worse mileage. Same car,same motor,in the same state of tune,with all other factors being the same,and a good conservative driving style you will get the best mpg with a 1bbl.Will it be a big spread? I think not,maybe 1-2 mpg.