Interesting that the owner's manual doesn't have anything.
Nor does the FSM.
The way I deal with situations like this is to tighten the nuts with the lug wrench that came with the vehicle instead of using an impact driver or air gun. It's nearly impossible to over-tighten lug nuts using the tire iron manually unless you're Arnold Swarzeneger.
After all, what farmer in 1950 was riding around with a torque wrench in his truck? He tightened the nuts as tight as he could by hand with the tool provided.
