He may have actually been going faster. He was reported to be going 117mph. The LAPD's policy is to cut off chases at 120mph, as pursuit at that speed is considered more dangerous. I would not put it past the pursuing officers to fudge the numbers a bit here in order to continue the pursuit.

Incidentally, that's a large part of the reason I don't sympathize. It was unquestionably an abuse by the police to beat him, and I'm glad they caught hell, but I'm not going to shed a tear for the man. It's a travesty the way their trial went.