A motor vehicle including an electric drive engine capable of being successively supplied with electric power by two separate electric power sources, in particular by a set of batteries and by a fuel cell, and of the type including an accelerator pedal that is mobile between a rest position and an extreme actuated position corresponding to the maximum power capable of being supplied by the engine based on the amount of electric power available for its powering. A mechanism is provided for varying the extreme actuated position of the pedal on the basis of a parameter representing the amount of electric power available for powering the engine.