The 2021 Li Auto ONE 6 - seater range extender model, which is one of the best used cars, is equipped with practical features such as automatic parking, 360 - degree panoramic imaging, adaptive cruise control, automatic braking, hill hold assist, parking sensors, a voice recognition control system, and vehicle networking. The range extender (a 1.2T engine) helps extend the vehicle’s driving range by generating electricity to power the motor, addressing range anxiety common in pure electric vehicles. This setup combines the convenience of electric driving with the flexibility of extended range via the range extender for buyers of best used cars.