I was advised by an NYC officer-friend to keep it within 15mph in excess of limit. Even with radar/laser detector, I make it a point to do so unless it's very late or early with little to no traffic.

On way back from Philly a few weeks ago, was on 95 north and a blazer SS kept egging me on. Although I could have taken him, I backed off due to medium traffic...sure enough, when i got to the exit for Staten Island, there he was stopped by none other than a yellow taxi...squad car in disguise. They're common in NYC.