In 1947 a pint and a half per gallon was recommended. I have been experimenting with a half a pint of Synthetic TCW3 and half a pint of Low ash aviation 40 weight oil. Lately Steve Woods has been mixing the fuel and I am not sure what it is , but Steve uses it in his Big Four. Dad used a gallon of SAE 60 weight to four gallons of unleaded high test gasoline in his Big Four, but it was extensively re-engineered and ran his 13 foot Lyman to a 54 MPH two way average through a measured mile. . . 😉
