I have a used 2013 mustang gt and the person before me did a lot of work on it and I have some few concerns . The car has an aftermarket fuel system (fore innovation). I was Curious if that means it can run off E85? and I know it needs to be tune and the Previous owner also did that but I have clue what tune is on the car because the previous owner didn’t leave his tune programmer. So I was wondering how can I found out what tune is Exactly on the car?