1) *** When exiting a buggy, pavement seems to count as "indoors", and your mewnaut will appear surprisingly far from the buggie in order to not be standing on a paved tile. In the screenshot below, I've left the front door clear so that wherever you park, you'll appear in front of the door for a quick entrance. (Also, you appear in the bottom left corner of the tile wedged between the airlock and the RTG; the middle of the tile would make much more sense IMO.)
Later on I was testing out the buggy health system, and managed to get it down to 10% health and two broken wheels (the front ones were locked to the right, but this didn't seem to affect how the vehicle mishandled; sometimes it went straight and sometimes even left).
This meant a long trek south to the fixit shop, pushing the front end back towards the road, and then driving a few tiles before having to straighten things out again.
So, when I finally got the buggie on top of the garage and started repairs, I was already in the red on O2. As soon as the wheels were straightened out, I floored it and took off for my base.
2) *** And the car trailed sparkly red +es the whole way :) Presumably because I left while the repairs were incomplete.
I held my breath long enough to take a quick screenshot, and then dove through the automatic airlock.