I can see u know of what u speak…I on the other hand am merely remarking on what I have heard about in the UK….that u can run a diesel car here on cooking/frying oil…..
where things get tough here is that Customs and Excise (taxman) do spot checks , mainly looking for farmers running what is called Red Diesel in their cars on the road….that is farming diesel with a red dye in it,….. and if caught …u really get hammered.