Originally Posted by Idaho
Top end is higher then then 147.6 mph for the coupe, I have had my 04 to 150 mph on the spedo and 152 mph as verified by GPSr for over a distance of 25 miles on the Nevada border and I wasn't matted so I don't know where my car tops out. I don't think I am going to find out either because that little stunt left a lot of miro pits in my windshield and would have done the same paint if I didn't have the bra on the car at the time.
Well, all of these numbers change due to altitude. So you'll get some small advantage the higher you go up - less dense air = less drag = faster car. The irony of it is that the less dense air also gives you less horsepower. So I don't know where that balances out.