The Mitsubishi 4A3 engine is a range of alloy-headed inline four-cylinder engines from Mitsubishi Motors, introduced in 1993 in the sixth generation of their Mitsubishi Minica kei car. A 1.1 L version was made available in 1999 for bigger cars, and was subsequently fitted to the Mitsubishi Pistachio, a limited production car based on the kei class Minica, equipped with the company's Automatic Stop-Go (ASG) system for cutting the engine when idling. So equipped, the Pistachio was able to record fuel economy figures of 30 km/L.