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Loaning a murderer your car knowing that he killed two police officers would land you in serious trouble. About your only defense would be that you did not know he is a killer. I doubt that police would take long to detect this fact. One thing they might do is trace every car registered in the area.
Edit. If he wanted to get away quickly his best bet would be to steal a bicycle. I hope he has plenty of cash. If he uses a credit card then the police will know where he is. Otherwise, he can stay in a hiding place that is well stocked with food, etc
until the police give up. That could take weeks.