DETROIT--Volkswagen, in its quest to understand and gain market share in the North American market, designed the CrossBlue concept specifically for the U.S. and Canada. VW calls it an SUV, slotting it in between the Touareg and the Tiguan, but it is much more than lineup filler. The CrossBlue not only boasts a diesel hybrid drivetrain, but can also be plugged in for better mileage. Its electric all-wheel-drive system is just icing on the cake.