I'm not in my car right but I know in my 2013 Elantra Limited w/nav, there is an option to what I believe is speed volume. Basically for anyone that may not know, it's suppose to adjust the volume according to your speed. But I haven't seen it really work in my car. I don't know if it's available in the Elantras without navigation, but I'd really like to hear some feedback on this. Maybe it's not this but based on what it's called in the settings, it's gotta be. It's under Sound settings.