I think that a lot of this is to do with the driver also, not necessarily just the car. Someone in a equally as fast car may have a much quicker gear change !!
Sorry to put a downer on this subject but from a Police background, discussions like this can be tracked via computer IP's (it doesn't help when you actually state places too) as i can gaurantee that you will always get a bored police man who will sit in one of these locations just waiting to catch people racing or trying to be bigger than one another.
I know how fast my car will go without having to do it so when someone pulls up next to me in a corsa (or similar) revving the engine then why risk losing my life when i KNOW that my car WILL beat it... Just a waste of petrol i think.