June 3, 1979 : Ixtoc I oil spill.
454,000 - 484,000 tonnes. April 20, 2010: BP Deepwater Horizon (Macondo Blowout) Oil spill.
492,000 - 627,000 tonnes.
September 16, 2004: Taylor Energy wells. Hurricane Ivan caused leaks to 26 wells near Louisiana.
62 - 96 tonnes. June 8, 1990: Mega Borg SE of Galveston. Explosions in a tanker's pump room caused fire and oil spills while transferring oil
16,500 tonnes. October 23, 2007: Kab 101 - Storms caused damage to Kab 101 causing collisions, leaks resulting in evacuation of oil rigs.
1,869 tonnes.
964,000 - 1,130,000 tonnes of oil
6.6 million - 8 million barrels of oil
275 million - 335 million gallons of oil1.05 billion - 1.27 billion litres of oil This answer is based on a using today's date, 09/21/2010. Make your own calculations for dates in the future.
Answer:
The gusher is estimated by the quasi-official Flow Rate Technical Group to be flowing at 35,000 to 60,000 barrels of crude oil per day (wikipedia.org). There are 42 gallons in a barrel, so that's 1.5 to 2.5 million gallons per day.
BP has stated that it is impossible to precisely know the amount of oil that is flowing. There is no place on the well to install a gauge. However, a task force has been established to estimate the volume of oil spilled in the gulf.
See related link.