I’m nearly getting to the point with my 49 Suburban project where I will be able to drive it

With the following specs is anyone able to take a shot at what Mpg it might return on the highway running at 70mph?

1949 Suburban
Stovebolt 261
Twin Carter W1 carbs
700r4 Box
Eaton H035 rear axle
Offenhauser intake
Fenton headers
6.50 16 Firestone




49 Suburban Project