Mine being one of the oldest ones in the department, it does get a little testy as you approach 100, the chargers seem to love going upwards of 100. The impalas aren't worth the equipment bolted on them.
The Sheriffs around here have the dark blue 'secret squirrel' Chargers and I've even seen a Dodge Magnum that was slicked out and was running down a speeder on I35.