Jaguar Have 3 Days Ago, (I only noticed today) Announced Their Latest Concept Car,

the XKX,

styled on the E type, this new concept has a new way for cars to generate electricity, the skin of the car is covered by a layer housing microscopic ripples of piezoelectric cells, which, stimulated by the pressure of the air flowing over them (the actual air friction experienced by the car) produce electricity that is fed back to the vehicle’s battery, increasing both efficiency and performance,

no performance figures have been given and chances are it will not go into production, pity the engineers after going to all of the trouble to get this so far do not drop a huge petrol V8/10/12 into it!