Playing nice isn't always an option.(NASCAR)

Since the concept of teammates was first introduced in motorspots, there has been friction to go along with it. Many of us have experienced sibling rivalry--"Mom loves you more than she loves me." Here's how it sounds in the garage: "Joe has the better engine, pit crew, crew chief," Racer X says, usually in defense of a lackluster effort.

But in Greg Biffle's case, where there's smoke....

On paper, multicar teams look great. There are many shared costs involving major machinery that make these organizations financially advantageous. And there's the additional data a second or third team contributes. Although most owners won't admit it--especially to ...