From what I have seen and played on this game 56,000 is believable, but the top score posted by Kadafi, I imagine is just a registry edit.
It's not hard to do
My Dad can get about 28 - 30, 000 which isn't bad. He was shocked when he came on the computer nadit said 100, 000 by me, then figured I had edited a registry key
So, Kadafi, tu n'es pas le meilleur