I'm not sure about the MPG yet, I'm still on my 1st tank of gas. It seems like the gas is lasting for a while so far. I have a mild 350 crate motor.
When I first started this project, I asked alot of probably dumb questions on this forum. Not saying yours is is dumb, but I know how it feels to not get a lot of replies. I really didn't know much at all when I started to build the car. Over all I got a lot of input from this forum.