Need recommendation for a Carb for better MPG!

Then that right there is the telling point of your experience. None. The 318 has always been a good mileage motor. The small bore lends itself well in that arena. I can tell first hand you don't know what's goin on here.
Yeah so, there you go again, bringing out the big hammer of insults.
As regards post 25
The man just told you his experiences.
How do you justify calling a man a liar for recounting his experiences, never mind insulting him, and then calling his intellect into question.
You're a hard-hearted man......... IMO