I have an 06 Cobalt SS/sc that I bought new in 06 as my dd. I average about 25 around town and have gotten as much as 35 on the highway. It runs high 14's in the 1/4(not the fastest around). It is my winter car also and the only thing you should do is get some good snow tires all around for...
Wow! I am not a fan of white cars, but that GNX looks spectacular! That has to be on of the most sweet cars I have ever seen! There is just enough black on it to offset the rest. Looks sweet!!!!!
It's possible that when the cables were put on the car reversed they did blow out the ecm. That is usually what happens. Hopefully that did not happen in your case. Good luck.