I found out a little more on the car. The first 100,000 miles was 80-90% hwy. The HUD only works sometimes, clock on the radio doesn't work. It had a new exhaust in 2005. and Michelin tires shortly after that but he has only put 10000 miles on the car since he retired in 2006. All service done at GM dealers since new. The more I find out the more I think I might be a gtp owner tomorrow!!