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How can fuel injection improve the fuel economy of a two-stroke engine?

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Labeled cross-sectional diagram of a V-type gasoline engine for an automobile, showing internal components such as pistons, crankshaft, camshaft, intake and exhaust valves, connecting rods, spark plugs, and intake manifold. — gasoline engine Cross section of a V-type engine.

In a standard two-stroke engine using a carburetor, a significant disadvantage is the loss of fresh fuel mixture through the exhaust ports during the scavenging process, which reduces fuel economy.1

Fuel injection improves fuel economy by allowing fuel to be injected directly into the cylinders after the scavenging process is complete. By avoiding the use of a carburetor to deliver the fuel-air mixture, the engine prevents the "short-circuiting" of fresh fuel out through the exhaust ports. This direct delivery ensures that the fuel remains within the cylinder for combustion rather than being lost during the scavenging phase, thereby increasing efficiency.12