That is a built truck Hoppy..very well done! Sadly it is built to much for gas mileage. A few things to try or check on is that your pipe is 2 1/4 inch all the way back. Check out your coil output, I have seen them put out barely enough juice to keep it going good. Maybe you carbed it to much also? Those factory carbs are great if they are adjusted right. Honestly you can put money into it but you will very likely not see and mileage difference worth it for that kind of money.
What you can do is drop to a 33 tire and regear it to 4.56 then you may see maybe 2-3 mpg difference.
You really did an excellent job on that build by the way. Many folks do not do it right like that. Excellent!!!!!!!!!!!!!!!!!!
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