And probably all of the carbon emitted in the production of diesel, from extraction, to transporting, to refining. Vegetable oil - in guessing, I don’t know - is far less polluting.

I didn’t read TFA, but if this can use waste vegetable oil, even if with some processing, there’s even more savings as you can discount much of the production cost as a dual-use savings.

I’ll agree with GP, though, that 6% seems incredibly optimistic.