According to pirelli.com their Wet tyres for the 2011 F1 season displace 60 litres of water per second at 300"kph" (which I presume means 300km/h). They contrast this to a road car tyre which displaces around 10 litres a second at regular road speeds.
The Joke: Not much it sank The truth: A floating boat will displace the same weight in water that it weighs. So the real question is how much does it displace or how much does it weigh
7.48 gals water
Quick and dirty answer: Because they are built to be essentially hollow, they are much larger in volume than the water they displace, and so in effect they are much less dense over all than the water they displace.
An amount that weighs as much as the ship does.
Air is displace by water because water is much denser than air and therefor is much harder to compress.
the weight of the ship is equal to the amount of water displaced
It must displace as much weight in water as it weighs (roughly 600 cubic meters of water). These boats have huge hulls, so can easily displace this much without beginning to sink.
The Titanic displaced 52310 tons.
buoyancyAn object that displaces its own weight in water is said to be "floating".
You must displace as much water at the metal weighs. So there is equillibrium between the metal and the water.
20,000 cubic kilometres
Sponges displace the ocean's water, and the water that they do "suck up" becomes part of their volume, and thus has no effect on the depth of the oceans. When you remove sponges, they will no longer displace water in the ocean, so the ocean will actually be shallower.