how to increase mpg

Sounds like you might want to do a "coast down" test to see if you have some excessive drag somewhere. Maybe get a friend to go out on a flat country road and hit 50-60 side by side then hit neutral together and see what happens. If he is behind you when you accellerate and loses sight for the smoke, maybe the choke is stuck closed. A /6 should do much better than 10 MPG.

Do you have enough air pressure in the tires? Oboma said if you properly inflate them you can get 50 MPG. LOL.