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A comment on Mazda hopes to achieve 56% thermal efficiency with gasoline engine. Parent comment

Re:Mazda hopes to achieve 56% thermal efficiency with gasoli... by jk2323 on Saturday February 03, 2018 @02:15PM (#16299028)
You realize that a "combustion engine" could be run with non-fossil fuels? From Ethanol, Buthanol or sun flour oil? Or even methanol witch could be derived from CO2 via reduction?
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