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I'm purely looking at tank to crankshaft here.
Depending on the speed you're calculating it at, it's still rather optimistic.
If it's a small engine and you're going fast, you might get that efficiency.
However this is not the forum for people going 150 km/h on the highway, rather 80-100 km/h.
Gasoiline has a HHV of 43 MJ/kg or 43000J/g, wich is 11,94 Wh/g or 83,75 g/kWh.
If I'm lucky I can average (!) some 300 g/kWh, wich is 3,58x as much or just under 28% efficiency.
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