Once home I tried getting into the drivers seat of my car. With a little gymnastics I was able to actually sit there. Then, I drove the half-mile to my mailbox. At 30° I was able to reasonably safely use the accelerator with my injured leg for that short drive. This is really good news as I'll be able to drive to PT which is only about a mile from my home.
I have been full weight bearing the whole time since the surgery. So walking with the 30° set on the brace felt very natural. I have been hobbling with just hiking poles for the last week or so. Now with the 30° free movement I think I'll do even more walking. I did walk a mile with the hiking poles before. Because it's a weird hobbling with a straight brace it seems I strained my back muscles. But, there was no problem with the knee. I'm hopeful the 30° will allow lots of walking without the back strain.
My next goal is getting enough range of motion for a stationary bike. And then actually getting on my mountain bike.