Had one of these for a long work weekend last week. I was very happy with it and surprised at the MPG (around 28) for my 800 miles that I put on it.
One thing to note, the spare in the trunk is an option. I would think National is putting it there for liability reasons. I took it out as I needed the room and left it in my garage. The S60 has a pretty slick tire repair system that is located where the spare would normally be. I guess they are trying this to save weight and space but no one would know how to us it.
I found this out from the owners manual as I needed to investigate how to fix a blown fuse for the lighter plugs that weren't working...