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At the end of that shift, the vehicle is then passed off to the officers in the next shift who repeat the process, because most police departments do not have an excess of vehicles. This is repeated 24 hours a day, 7 days a week until the vehicle is retired. Does continued usage of all the features of the vehicle nonstop contribute to excessive wear on its electric, HVAC system, and interior that would not occur in a personal vehicle? I am sure it does. This is not even including how hard they are driven when they are used to chase down bad guys. This is not to say these vehicles are a bad deal per se, but due diligence is needed in evaluating the mechanical worthiness, even if the vehicle has low miles. Some of these fleet vehicles might have hour meters which indicate the time it spent idling, but that is not always the case.
Of course, there are vehicles reserved for higher ups that just sit on the lot all day and night. However, those vehicles are few and far between. My advice if you want to buy a fleet vehicle: Look for a vehicle sold by government agencies that do not require its operator to sit in the vehicle all day. These are better choices since these vehicles are most likely used for traveling from point A to point B. Or you can buy one used by an old lady who goes to town to buy groceries once a week, those remain the best bargain.