The BMW 6 Series is a series of luxury grand tourers produced by the German automaker BMW. The 6 Series Gran Coupe (F06) was unveiled at the 2012 Geneva Motor Show. The Gran Coupe has often been compared with the Audi A7 and Mercedes-Benz CLS-Class in the four-door executive coup? market, but it is larger and more expensive. It is manufactured with both diesel and petrol engines, and it is available only as automatic. All facelifted BMW 640i models burn 0.2litres less fuel per 100km than its pre-facelift model.