Only problem is in the economics. Kind of like making ethanol for gasoline addition or blending, where it takes more petroleum based fuel to operate the farm than the ethanol you get back. BioD seems to be priced substantially higher than DinoD everywhere I have seen it advertised. Does seem to be a cleaner alternative though, and if the coking issues are not too substantial could be successful in the long term. The economics need to be right though!

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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150