This excerpt taken from the MRO 10-Q filed Nov 4, 2005.
related to matching buy/sell transactions for the third quarter and first nine months of 2005 increased by $841 million and $2.724 billion from the comparable prior-year periods. The increases are primarily due to increased crude oil and refined product prices and increased crude oil purchase volumes, partially offset by decreased refined product purchase volumes. Differences between revenues from matching buy/sell transactions and purchases related to matching buy/sell transactions for the third quarter and first nine months of 2005 are primarily due to timing differences between the delivery and receipt of certain matching transaction volumes. There is no effect on income as a result these timing differences.