It is generally recommended to operate a Polaris vehicle in high gear when driving on smooth, flat surfaces and in low gear when driving on rough, hilly, or muddy terrain. The high gear setting is designed for maximum speed and performance, while the low gear setting is designed for maximum torque and traction. The specific gear setting that is best for a particular situation will depend on the terrain, the vehicle's load, and the driver's skill and experience. It is always a good idea to refer to the manufacturer's recommendations for the proper use of the vehicle's gears and to use caution and common sense when driving on any terrain.