Again, just because BMW has one, they don't even have commercials for it, so, I wouldn't even count THAT as old news.
And Ethanol is not water, and I know they ran on alcohol. Alcohol made from hemp specifically.
The US Navy doesn't make adverts for its nuclear powered submarines
but I'm quite sure they exist.
I've never seen an advertisement for Papal Triple Tiara
but I know the Pope has one.
And my Uncle Bill has never appeared on TV to publicise his haemorrhoids
but we all know the poor bastards suffers from them.
(You can tell by the way he walks on hot days).