Originally Posted by Penguin

I found it hard to believe, so I measured it and, sure enough, while the X5 may weigh almost twice as much as my Focus, it has less cargo space, and the available space is less useful (the BMW rear seats lean backwards a lot, so it makes the rear space less usable with the rear seats up, and the rear window slants forward more, making the last foot or so of space unusable for taller items.)