Does it work for you? I don't notice a difference at all.
I think I have mine on 2. Is that the max?You can adjust the sensitivity of the speed volume adjustment. I have mine on the max sensitivity and can notice a difference - however you shouldn't really notice the increase because it's just accounting for increased road noise to stay at the same relative volume.
I'm not sure.Was speed volume just a 2013 option? I don't remember reading anything about it on the 2012s.