318 mpg

I finally got my 318/904 dialed in with a new 500 cfm Eddie carb and an SP2P intake. I was getting about 16Mpg before the swap with a cast 2 bbl on it. Anyone curious what the change might be?

If so I will let you know in a coule of weeks of monitorng driving 40 miles a day mostly freeway at 65 Mph.