I love this thread! I was just thinking about posting a similar thread last week but instead pertaining to your individual car as opposed to fourth gen Legacies. This thread makes more sense though.
I noticed the 37° warning two nights ago for the first time. I wouldn't have known what it meant except that one time I had a rental Camaro with the same feature but the Camaro had a more explicit message that it may be slippery.
One thing that I found weird about my car after I bought it was the dash warning about an ominous "Anniversary Date." LOL
And yes, The radio volume maxes out before the sound gets very loud. In my third gen you could blast the volume to the moon, well past the point the speakers could handle it.
Here's a quirk that really irritates me: The car is a 2.5L Turbo but has a classy, built-in non-numerical, meaningless, analog MPG gauge that just sways back and forth but doesn't really tell you anything. All you can infer from it is, when you put your foot down on the accelerator, your gas mileage is worse, and when you let off, it is better. Haha you don't say... Why couldn't that be a boost gauge instead? How sweet would it be to have a built in integrated boost gauge in the gauge cluster? Instead there's no boost gauge at all.