Your dilemma: you have a burning desire for a 5,000 pound, four-passenger truck that accelerates as fast as your Dodge Challenger, but you want to use as little gasoline as possible while doing so. BMW feels your pain, and they have a solution for you. Ladies and germs, meet the ActiveHybrid X6, BMW's first full-hybrid. Here's the great part: engine-wise you get both the 4.4-liter twin-turbo humdinger of a V8 and two electric motors for a total combined...