Fuel Economy..?

before I start, I get distracted easily, so please bear with me if this is confusing. I'm also not sure if this is in the right forum or not.

currently I have a 340 Scamp that in building for the street and and annual or bi-annual trip to the strip, obviously being a semi-race car hot rod whatever-you-wanna-call-it it doesn't get too great of mileage, my daily driver is a 1999 ford ranger 4 cylinder 5 speed, $20-$25 gets me through the week, I feel more at home in older vehicles, my first car ever was a '74 ford maverick 200 i6 auto Trans that also only cost me $20-$25 a week to get around where I needed to go. to be honest, I think I was driving the maverick more than the ranger.

basically what I'm getting at is I've been considering trying to get my hands on a slant 6 car as a daily driver, so what kinda mpg's am I looking at in a slant car?