you should be around 18-18.5 secs, but your elevation is super high, I have gotten a 17.2 with just CAI/muffler with a device I have (more info on my build page) I have never ran over a 17.8 though, even on the hottest days, but elevation makes a difference

nemasys, tow trucks are that fast?

i thought you would be at around 15 with the aveo and its new head gasket?