Been running my Fitech install about a month and it runs great but I noticed my MPG went down compared to carb.
I checked the ported vacuum and it doesn't give any vacuum until 3500rpm so this is my problem. With my 518 tranny cruising RPM is 2000-2500.

FiTechs only solution is to use manifold vacuum, sounded like a known problem.
With my initial set to 15, won't this cause hard starts?

Any other ideas?