Stewart,
with this recipe you won the No 9 in fuels recipes in the fuel thread!
I guess it is a very good balance between ingredients, with a simplicity of starting and running affordable to everyone. Throttling should be superior to straight castor.
I think it is better that you, if you want, fill the form there reporting also some interesting additional data, as engines, etc, and comments
I am curious about your present olive oil. Have you tested the straight one? Mine works exactly as the double modified one!
I am presently collecting a wide range of data from literature, and nextly you will see some first interesting viscosity diagrams that support the choose of mixing olive and castor.
Ugo