Congrats on the car, you are extremely lucky to work for a company that would give you an Xfire as a company car.

As for the tire pressure warning light, check to make sure you have all of your valve caps. Recently two of mine were stolen, and it set the Tire Pressure Sensor off. There are little transmitter/receiver's in the caps. took the car to the dealer, and thats when we discovered that the caps were missing caps were replaced and calibrated for $8.43 no labor charge.