Hi, I'm new here to this forum and just got my ATS a few months ago. I have a 2013 ATS 3.6L Performance RWD. When I or the dealer look up my VIN# it says Fuel Type: gasoline e85 Ethanol. My gas cap is a regular black gas cap not yellow. I've tried running e85 and it ran rough and have a check engine light until I emptied the tank and filled up with 87. Can someone explain to me why my VIN# says e85 Ethanol but my engine won't run it? Very confusing. Tried asking the dealer and they were just as confused as I was. Running 87 is fine no issues and I have not tried any other fuel type. Couldn't find anything online about this issue.