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{{Short description|Measure of the fuel efficiency of internal combustion engines}} ...It is typically used for comparing the efficiency of [[internal combustion engines]] with a shaft output. ...

...minated by combustion products. Working fluids for ''external'' combustion engines include air, hot water, [[pressurized water reactor|pressurized water]] or ...r of the diesel engine, [[Rudolf Diesel]], was using peanut oil to run his engines.<ref>{{cite journal |last1=Shay |first1=E.Griffin |title=Diesel fuel from v ...