[big al]

Seems like the issue of generic fuels could make a seperate topic & could be split off as it is detracting from the landlord issue.
I don't know much about the development or past of this "new" fuel other that a mention on a news channel. I do know that Saab/Ford do claim to have a new engine capable of running on the stuff as this is on the search engine site I accessed when looking up on the web under green fuels. It is definitely not LPG as you have used Entwisi, but a by product of vegetable oil called Mono-alkyl ester. I am not certain of the similarity with the German product. I wouldn't expect Tesco to sell something that had a history of damaging engines though, would expect they have enough backup to ensure safety of such a large selling product. I assume that this is primarily a diesel engine fuel though, not petrol.