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I have a 2006 MZ6/Z51 built 6/21/06 w/1400 miles on it. I finally got around to checking the lug nuts for proper torque. 3 of the nuts out of the total four wheels were torqued properly. About a half a dozen were very loose. On one I thought my torque wrench broke since I had to take several turns.
Highly recommend taking the time on your new 07's (and/or other C6's) to check lug nut torque.
On our 2006 they were correct from the factory, but any aluminum wheel will develope loose nuts after a bit of use. My technique is to retorque them at just 20 miles, then every 100 miles until I get two tries where they are tight.
My wheels have been on the car for about 9k miles, I retorqued them just before a 3,400 mile road trip and checked again when we got home, some of them had loosened a little.
Mine ok also. I wonder if they do a check at the NCM at delivery time set up.
Hell they check a lot of things its possible
I don't know what they do but whatever, I like the way mine was delivered. It also had 8 mi on the odo. They said that meant that mine got additional QA testing - whatever that entailed. Bottom line - I love my C6 more than I did my C5 and boy did I love THAT car!!!