Hybrid Cars

Hybrid vehicles are those that use two fuel sources for energy; an on-board rechargeable energy storage system (RESS) and a fuelled power source. The majority of hybrid cars are petroleum-electric hybrid vehicles (also called Hybrid-electric vehicles or HEV), which use internal combustion engines and electric batteries to power electric motors.

Nearly all hybrids use petrol or diesel as their fuel source, although other fuels such as biobutanol, bioethanol or other biofuels may also be used. A number of other hybrid vehicles use hydrogen fuel.

Vehicles can prolong the charge on their batteries by capturing energy via regenerative braking (i.e. storing some of the kinetic energy that would otherwise be lost to heat when braking).

... that hybrid cars generally attract the lowest band of car tax, and are also exempt from the daily congestion charge in London?