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8 minutes, or .133 hours, times $20/hour is $2.66 saved per day... maximum. How long does it take to setup before use? Simply looking at how fast a single lug takes is not looking at the entire process. Also, that time saved means less income for the mechanic and shop because they charge by the hour....
I can see this being great for production lines and I assume that is already an automated process where an electric machine is measuring the torque as it tightens the lugs.
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