Well, it's widely added (in small percentages) to regular diesels, mostly due to its cleaning properties. Even if you run 100% bio it still produces large amoun

Well, it's widely added (in small percentages) to regular diesels, mostly due to its cleaning properties. Even if you run 100% bio it still produces large amounts of PM2.5 pollution (less NOX than regular diesels, but that isn't none). And there's plenty of evidence that unless it was produced from non-food crops it's more less using food that should go to people to run your engine. I am happy to have switched from a TDI running 100% to a PHEV.