What's the difference between AWD and 4WD? I was handed the keys to the brand new BMW M5, which can actually switch between 4WD and 2WD! Nothing all that impressive for any truck drivers out there ...

With part-time AWD, the vehicle will switch automatically between 2WD and AWD depending on road conditions or to boost fuel efficiency, which is how the newer Mitsubishi "Eclipse" crossover operates.