The HEV Series refers to a range of hybrid electric vehicles that combine an internal combustion engine with an electric motor. This design allows for improved fuel efficiency and reduced emissions compared to traditional gasoline-powered vehicles. The electric motor can assist the engine during acceleration and can also power the vehicle at low speeds, enhancing overall performance. These vehicles typically feature regenerative braking, which captures energy normally lost during braking and uses it to recharge the battery. The HEV Series is popular among environmentally conscious consumers looking for a balance between performance and sustainability, making it a significant part of the automotive market.