What kind of fluid is used in the hydraulic system?
HHV components are relatively simple and made out of common materials using well established manufacturing processes, and are therefore relatively low cost, compared to HEV components. Additionally, HHVs are very efficient in recovering, storing, and converting energy. Regenerative braking in a HHV is capable of recovering and re-using over 70% of the energy normally wasted through braking. Fuel is saved because HHV systems can eliminate engine idling and enable the vehicle to be driven with the engine off.
