A good mechanic will tighten lug nuts to the proper torque as specified by the vehicles specification.
They should first use a low torque setting on their impact wrench and then finish tightening them with a calibrated torque wrench.
The Subaru Forester lug nuts have a torque value of 73.8 ft lbs.
No one should try to tighten lug nuts without using a calibrated torque wrench unless you have a flat tire and don't have access to one.
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