1. Interactions through Feb ‘11 OnStar Vehicle Diagnostics - Over 173 Million Emails Sent Good Samaritan 503,000 Cumulative Subscriber Interactions (North America) Automatic Crash Response Over 162,000 Emergency Services Over 1 million RoadsideAssistance 2.6 million On-Demand Diagnostics 4.3 million Stolen Vehicle Assistance 54,400 Turn-by-Turn Routes Delivered* Over 72 million Remote Door Unlock - Over 5.1 million OnStar Hands-Free Calling - Over 2.6 Billion Minutes** Purchased One Very Hardworking Button 350 Million Cumulative Service Interactions *Includes Advisor and TBT delivered routes *Includes Unlimited Bundle Sales OnStar Mobile Applications – Over 1,146k Downloads

2. All statistics are 3 Month Rolling Average (Dec ‘10 - Feb ‘11) except for Mobile apps which is for the month of February U.S. and Canada OnStar Vehicle Diagnostics -Over 3.7 Million Emails Sent Good Samaritan 6,800/Month Monthly Subscriber Interactions (North America) Automatic Crash Response2,600/Month Emergency Services 10,000/Month RoadsideAssistance33,000/Month On-Demand Diagnostics 58,500/Month Stolen Vehicle Assistance 450/Month Turn-by-Turn Routes Delivered* Over 1.6 Million Routes/Month Remote Door Unlock Over 58,900/Month OnStar Hands-Free Calling - Over 72 Million Minutes** Purchased/Month *Includes Advisor and TBT delivered routes **Includes Unlimited Bundle sales One Very Hardworking Button 350 Million Cumulative Service Interactions OnStar Mobile Applications – Over 392k Downloads

3. 3 Month Rolling Average (Dec ’10 - Feb ‘11) GoodSamaritan350/Month Monthly Subscriber Interactions - Canada Automatic Crash Response180/Month Emergency Services 310/Month RoadsideAssistance1000/Month On-Demand Diagnostics 5,600 Month Stolen Vehicle Assistance 30/Month Turn-by-Turn Routes Delivered* 58,600/Month Remote Door Unlock 3,400/Month OnStar Hands- Free Calling Over 6.8 Million** Minutes/Month One Very Hardworking Button 350 Million Cumulative Service Interactions (North America) OnStar Vehicle Diagnostics Over 270,000 Emails Sent *Includes Advisor and TBT delivered routes **Includes Unlimited Bundle sales