same here, i've brought my limited to the dealer 4 times with a check engine light, and 4 times they haven't a clue what the problem is. So, i have gotten rejected 4 times for a sticker.

Shoot, i'm 16, i get my license in July. How much can i drive? It's gotta be the gas. I'm not sure how ethanol affects us, but I would say an increase in ethanol in our regular pump gas may be to blame.