BMW built its hybrid system into its new X6 concept vehicle. BMW refers to the X6 as the first-ever Sports Activity Coupe, although we count too many doors to call it a coupe. The X6 is supposed to be what you get when you mix a BMW sport coupe with a BMW X-vehicle. Given the current trend in crossovers, there is momentum for BMW to bring the X6 to production. The ActiveHybrid version of the X6 is supposed to get 20 percent better fuel economy.