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• EIA defines isobutanes as "a normally gaseous branch-chain hydrocarbon. It is a colorless paraffinic gas that boils at a temperature of 10.9º F. It is extracted from natural gas or refinery gas streams."
• Isobutane stocks in April 2008 jumped 45% compared to March 2008.
• Isobutane stocks are up 44% compared to the same period a year ago. ...