comment: >
  
  I think probably the majority of us now have battery powered key fobs that go everywhere the regular key goes.
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  Two sets of keys for one car.  The car travels a lot further than either key.  
  Maybe taking the keys on a plane a few times will balance it out >
  
  My keys do plenty of business trips on planes. >
  
  What would you say are your key business travelling tips? >
  
  My wife has her set of keys I've mine.
  On average they will travel half the distance >
  
  The way I see it unless your key is in your car at all times they will travel more. Park your car at the store go inside and shop and do a bit of wondering thats your keys doing more traveling then your car is at that moment. Drive your car to a park to take a nice walk around there, car parked keys in your pocket moving right along with you. >
  
  What if your spouse drives your shared car 5000 miles per year for her commute using her set of keys? Gotta take a lotta nice park walks to offset that mileage. >
  
  Yup, and 5000 miles is way less than the average car travels in a year. >
  
  I rotate them every 4 months to allegedly wear out the batteries evenly. Each of them have travelled less than half the car. >
  
  How do keys have batteries? You turn the key, the door opens. Where does electricity even go in the key.