/6 4bll intake.

So, just wondering those who are running the 4 barrel intake with a 390 what sort of mpg are you getting? Probably not the purpose of a 4 barrel swap, but with the price Super Six setups are getting and how hard it seems (in this area at least, if someone has one for sale PM me) to find a complete one to bolt on, just wondering if this is a viable option? Absolutely stock 225 1 barrel now with 904 and 3.21 rear gear. Not had it long enough to get an accurate mpg as it sits, but am told I can get better mpg and more power with a super six setup. MPG is the key for me right now. Seems like the availability for the 4 barrel intake and 390 carb is a lot easier. Can it be tuned for good MPG?
Sorry if a bit of a thread highjack. I hope it is in the same vain topic wise.
Cheers