i just tried mine the other day for the first time (1,400 miles, +/-)--Z51, npp,at,all season tires (not stock), turnpike-type road,non-launch mode, touring mode. did 4.5 seconds, only one pass. the best ive seen is i believe 3.7, posted on another forum, and the average (median) seems to be about 4.2. assuming a normal distribution, id say from the data that 3.7 and 4.7 would be about the 3rd standard deviation. you have to assume that the 3.8 was the best that could reasonably be expected, and that the typical conditions would not produce that time. also, i have to try the sport and track mode. note to OP: if you have not tried this before, and never driven a really fast car (which was my case), hold on tight. youre in for a real jolt.
******UPDATE: did second run, in sport mode this time: 4.2 seconds--im a contender(i arbitrarily set 4.2 seconds as contender status, until someone comes up with better criterion)! shpuld have mentuoned i have AT.
im going to try the track mode, and work up to launch mode. goal is 3.8 seconds. ill buy, if i hit it. it doesnt sound like there are very many out there that have tried the launch mode. afraid? personally, i dont think the trade off of the wheel spin vs. higher launch revs is worth it--particularly with police around.