Valery will have more detailed information, but here's the fuel consumption/HP/torque graph for a large (100HP) Hirth water-cooled 2 stroke using fuel injection/electronic ignition:Jbiplane, a two stroke that burns at the same hp as a 4 stroke the amount of fuel, is this possible today?
At 80 HP, it is burning 4.8 gal/hour (18 liters/hour), which is about the same as an air-cooled 4-stroke engine. It's a bit hard for me to believe, honestly.
Price: The U.S. distributor sells this engine, with starter and PSRU gearbox, for about $14,000. Weight for engine, gearbox, exhaust, but without radiator: 127 lbs (58Kg)
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