Hi, I have recently converted to the super six set up and my gas mileage is sort of crappy! I measured it the other day and I’m only getting around 16mpg on the freeway. I don’t know for sure what I had with the one barrel but I think it was better than this.

I think I may be over compensating for the two barrel ‘bog’ by running it on the rich side. I read a post somewhere that suggested that the needles could be changed to ones that have a bigger step between the economy portion and the power portion.

Does anyone know where I can get other needles of different ranges and what would be a good starting point in needle step size? At the moment I think I have 2216 size needles in there with 120 size jets.

I have one of the later model Carter two barrels and have set it up to speck as stated in the fine tuning tech sheet on this site. Everything else on my six is working well and I have done the re-curve on my distributor.

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'67 Dart 225 Super Six