Best way I can figure is to put some in a jar and mix it with water. Ethonol is put in gasoline and will mix together with water to separate out. However, it'll likely have the same effect if there's any biodiesel.
As for any pure petroleum bases products (pure gasoline, mineral oil, whatever), you'd likely have to get a bit more scientific with burn rates and ignition temperatures.
You can test the specific gravity of the fuel
(post is archived)