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I have a body guy that pointed out to me how to tell how fast people travel on the highway.
After five or so years there are going to be a few paint nicks or chips no matter how slow they drive that is just the way it goes. But when you see a car that the front end and mirrors look sand blasted you can bet the driver is exceeding 70 mph on a regular basis.
That is the other reason to keep your speed down is to keep the paint damage to a minimum. At 55 mph a stone or bug is hits your car at 81 fps. At 70 mph that same stone or bug is hitting your car at 103 fps. At 80 mph it is 117fps.
At lower speeds under 45 mph not much small road debris is even going to penetrate the clear coat. Once you get over 50 mph the possibility of small objects thrown up by the vehicle in front of you punching through your paint goes up proportionally to the increase in speed. You drive at 55-60 mph and someone else with the same car drives at 70-75 mph you will have maybe 10-15% of the paint damage they have on their car over five or so years.
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