BTW, if you've never driven a BMW, test-drive one. They drive like nothing else in this world.
It's funny but you even have to consider this with consumables like toilet paper. If you get the cheap stuff it's practically half-ply so you have to use 3 times as much. Better to get the 3-ply that costs twice as much.
I answered your BMW comment here: http://news.ycombinator.com/item?id=1779306