In who's universe?
Just because you have an excess or surplus of something doesn't mean that you are going to give it away.
Look as surplus milk, it is turned into milk powder and the surplus of cream from the production of skim milk usually goes to secondary products like icecream base. (It is the actually the only reason that we have the Streets product "magnum" on the market.)
free and surplus are independant of each other.


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), but the addition of another fuel source to the diesel combustion cycle is common, either as a gas as you mention, or as a liquid additive to the diesel (ie Diesahol fuel, a blend of Diesel and Ethanol has been used in Sydney Buses to reduce emissions and enhance economy).
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