Im getting terrible gas mileage and im guessing its from my gas boiling in my holley carb. I was wondering if there was anything you guys think i should do to help this problem or maybe increase my gas mileage.

Is there a reason you think it's boiling in the carb?

Less dense fuel rarely would cause poor mileage. But, on the off-chance that the fuel is boiling in the carb, Holley makes a shield that goes between the carb and intake manifold that would reduce the heat that is getting to the fuel bowls.

What are you using for a fuel pump system?

(Have you considered possible effects from your custom cup holder???