Thanks to dogshawred for great information on what to do if you suspect the car pulling you over is not in actuality a LEO.

However, if the fake cop actually gets to your window, gun drawn and demands your wallet, keys, etc... what choice do you really have? It's either comply or die at that point. So what would I do, I'd comply. If while I'm forced out of the car, he drops his guard for one moment, then I may have the opportunity to draw on him, but not likely.