[aerohead]

Vegetable oil and diesel provide a 'lubricity' in a compression-ignition engine which is not a requirement in an electric ignition engine.
If you'll visit the American Petroleum Institute's ( API ) website you may find some info on what separates the fuel requirements between a Diesel and Gasoline engine.
There are pour point, Reid vapor pressure, thermal heating value, flash point, etc., which separate the two fuels.
Diesels operate at compression ratios gasoline engines cannot survive. They are governed by 'Cetane rating, while gasoline engines are governed by 'octane' rating.
I've had 12-semesters of formal automotive training, and never was it recommended that 'ANY' additives be added to a motor vehicle, especially with gasoline engines.
For a few years the local city fleet experimented with bio-diesel, until the EPA shut it all down. There was 'more than met the eye' involved, and the 'veggie' oil tuned out to be a 'bust.'
I recommend that you abandon all efforts to make it work. Cut your losses.