Which major part of the carb (Venturi?) is most likely to be the culprit here given that I have done/fixed/checked/danced over everything else?

This is seriously pi**ing me off. It makes no sense, unless the unexamined carb part is the sole culprit; you would think that all of the crap I have done so far would have had some kind of additive effect to increase mpg at least slightly. More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.