at our shop we snug with the impact, i grab a torque wrench and do them, whats it take 2 mins to go around car.. i got in the habit because we have people saying lug nuts were to tight with air gun, and warpped there rotors or they couldn't get the lug nuts off for flat tire. were no dealer or certified for ford chevy, mopar etc but we sure do have alot of customers that trust us to no end and gonna keep it that way, do the best honest work you can, charge right and don't lie. picked up close to 20 new customers in the last few months. were busy everyday single day. end of the day i do not have any doubts about my work.