I read somewhere that if you are staying in the LM rooms its not a bad idea to drive your car to the bus stop and park in a spot closer then take the bus. That way at the end of the day your car is right there and you aviod a long walk... is this really a good idea?
I think it depends how much you want to avoid the walking. Depending on where your room is, it could be a decent walk from your parking space to your room, even when you are in the lot closest to LM. So that would impact how much walking you'd avoid. Even in the best circumstances, I'm not sure you'd really end up ahead that much.