Soooooo....if burning oil is considered part of the fuel's combustible mix, what is the stoichiometric ratio of 927?
I think I remember seeing the heating value of pure castor oil is somewhere around 18,000 BTUs per pound.
Gasoline's heating value is around 17,000 to 20,000 BTUs per pound. Methanol is around 9,000 BTUs per pound and ethanol is somewhere around 12,000 BTUs per pound. I think that most petroleum based oils and greases are in the 15,000 to 23,000 BTUs per pound.
The ratios of the heating values of a substance is usually directly related to the stoichiometric combustion ratio.
The theme of the above post was to point out that: You would not need to change more than a couple of jet sizes to produce the same A/F ratio going from straight gasoline to 20:1 premix.
The above theory seems to agree with my years of experience tuning engines on the dyno. I have observed very little difference in jetting for max power as I change from one premix ratio to another.