Method of operating a vehicle and a vehicle

A method of operating a vehicle at different altitudes, the vehicle comprising:

• an engine;
• a throttle operator being operable by a driver of the vehicle;
• a throttle valve regulating airflow to the engine, a throttle valve position of the throttle valve being based at least in part on a throttle operator position of the throttle operator;
• a continuously variable transmission (CVT) operatively connected to the engine, the CVT including a driving pulley, a driven pulley, and a belt operatively connecting the driving pulley to the driven pulley;
• at least one ground engaging member operatively connected to the driven pulley and comprising at least one of:
• a wheel and a track;
• a piston operatively connected to the driving pulley for applying a piston force to the driving pulley when actuated and thereby changing an effective diameter of the driving pulley;
• and
• a control unit for controlling actuation of the piston and the piston force,
• the method comprising:
• determining at least one of an altitude and an atmospheric pressure;
• determining a driven pulley speed;
• determining at least one of the throttle operator position and the throttle valve position;
• selectively actuating the piston based on the at least one of the altitude and the atmospheric pressure;
• controlling the piston force based on:
• the driven pulley speed;
• and
• the at least one of:
• the throttle operator position and the throttle valve position;
• and
• controlling the piston force based on at least a first control map corresponding to a first altitude and a second control map corresponding to a second altitude based on the determined at least one of the altitude and the atmospheric pressure.