Slant Six mpg's?

I have a 74 scamp as my daily driver (except winter) /6 with OD manual tranny gears unknown (7 1/4) header small 4 barrel carb single exhaust.As I recall factory /6 cars in the mid 70's would get upwards of 30 mpg with smog system.As i never checked the mpg on my Scamp and since it can now breath a lot better I would guess it get's in the 30 + mpg range and is still somewhat fun to drive.My friends made fun of me when I made this car but not now.