Hey all, I just installed a fresh 400 rebuild in my truck, same motorcraft 2v carb and manifold, stock rebuild except for timing chain and cam. My mpg right now is around5-6 intown, I know motors are tight when they are fresh but this seems really low. Before the rebuild I could count on around ten in town and 14 Hwy, maybe I will gain 1-3 mpg's after breakin. But this is worrying me.

What are you people getting for mpg with your 400's?