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A speedometer thread got me thinking about this but it is relevant to this thread.
I've never owned a truck. They are plentiful around here, drive very fast, and usually jacked up, huge tires, etc. How much does the speedometer change with those big tires? I know they are told about the speedo change with the tire upgrade but do they register this idea? I have a theory they still drive at max limit according to their speedometer and think they are in compliance. If the majority of vehicles are like this I can see how habits can reinforce this new faster average.
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