Garages, tyre workshops, AA/RAC breakdown etc should ALL know that using an airgun to overtighten a wheel nut / bolt can damage and stretch the thread, and can cause the nuts to shear, with disastrous consequences. Airguns are handy to use to spin the nut/bolt up, but then finish off with a (preferably) calibrated torque wrench.
Anyone who knows what they're doing should use one, and put a small amount of grease on the threads of the bolt. Audi alloys should be torqued up at 120NM - the bolts won't stretch, and they're tight enough not to come loose under normal circumstances.
They should also be checked after 100 miles for safety and peace of mind.
AND - with the grease on the threads, they stand a chance of not seizing!