[bratticus]

Which weighs more, crude or condensates?

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Total world oil production in thousand barrels per day and million tonnes

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2008 82015 3933.7
2009 80278 3831.0
2010 82095 3913.7
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[Adelaidewonderer]

Thats easy, there was a greater percentage of light crude in the 2010 mix, than there was in the 2008 crude. Light crude weighs less than heavy crude

[bratticus]

Condensates contain less total energy the crude. As the percentage of condensates is increased in the mix the weight falls along with the total energy. It's like buying a cheap hamburger where the meat is filler instead.