A motor vehicle comprises a compressed gas engine, wind resistance engines, reversing devices, a drive train and wheels. The compressed gas engine has a primary power output shaft driven by compressed gas to output main power, and each of the wind resistance engines has an impeller shaft driven by front resistance fluid to output auxiliary power when the motor vehicle is in motion. The main power outputted by the primary power output shaft directly drives the drive train, the auxiliary power outputted by the impeller shaft drives the same after being reversed by the reversing devices, and the output of the drive train drives the wheels.