It was just an estimate based on my little Mazda3 hatchback (3k lbs). I looked a little more and saw that some of the higher-end vehicles don't weigh that much, but some, like the Veryon, weigh close to 4k lbs.
Of course it wasn't meant to be totally accurate, just interesting to say that I have ~900 scaled HP.
And anyway, like I said, it was idle thought.