A four-cylinder truck is a truck that contains four cylinders, each holding a piston that connects to the vehicle's crankshaft. Four-cylinder engines are considered very fuel-efficient and environmentally friendly, producing less exhaust than traditional six-cylinder engines.
Four-cylinder trucks are typically small and compact. They are normally not as powerful as trucks with a six- or eight-cylinder engine, and they have less towing and hauling capacity. To make up for the power difference, truck manufacturers sometimes offer a supercharged engine, which offers the power of a six-cylinder engine but weighs less. Japanese automakers, such as Honda and Toyota, started using four-cylinder engines in their cars in the 1980s.