Never drive above your comfort zone on the road.
Most groups are civil and tend to divide into groups depending on whether you're a road warrior or a stop and smell the roses kind of driver. It's a good idea to determine this for youself before you start out. The idea of these runs is to enjoy your car, the ride and get home in one piece.
You're always going to have the A type personality, highly competitive guys who'll raz you. But who cares, give it right back to them - believe me, they enjoy that.
