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Depends on the driver, the track conditions, and the atmospheric conditions.
However, GM is advertising 0-60 in 4.6 secs. with auto without Z51, 4.5 secs. with Z51. 1/4 mile in 13.0 secs. @ 110 MPH without Z51, 12.9 secs. @ 110 MPH with Z51.
Don't think we've heard of anyone turning those speeds & times yet, but some are not far off the pace. Get a few more of the cars broken in and some more seat time for more C6 drivers, probably be pretty close.