if it's OVER a certain value when the radio's shutoff, then the next time you restart the car, it's set at 'medium'. However, if it's below 'medium', then the next start-up is at it's last-saved value.

I've given this a lot of thought, and I wouldn't want it to work this way. I'd want it to be set to X value every time on each in-car bootup. I would never want it to be lower than that.

I can see how some people would prefer it the way you described, but this is not what I would want.