A new concept hybrid vehicle is introduced based on energy substitution. This is best realised in a Supercharger Air Hybrid Vehicle (SAHV) which uses a supercharger-tank-engine energy chain for regenerative braking. In the SAHV, a supercharger is added to a vehicle with a fully developed highly boosted downsized engine, and its main function is to act as a vehicle brake. The SAHV uses braking energy to drive the supercharger instead of using engine energy to drive a turbocharger to produce an equivalent amount of boost air which is stored temporarily in a low pressure air tank. This provides regenerative boost to the engine for free for short periods during accelerations after braking. At the same time the saved engine energy is available fully to drive the vehicle. This process represents 90+% recovery of the captured braking energy when the saved engine energy is returned to the vehicle, which is equivalent to the braking energy captured earlier by the supercharger.