I have noticed that I am getting alot more oil from my hame brew fuel than with store bought fuel coming from the exhaust. I blended my fuel by weight, to 2 decimal points, using the Specific gravity of the 3 components, with 10% Nitro, 19% castor oil and the rest methanol.

Since castor oil doesn't burn off like Synthetic will, is it OK to use a lower oil content when using straight castor?

Thanks

Doug