if this SEC doc. is correct ... then would approx 528 USO = 1 QM ?
( QM = 1/2 size crude oil contract on nymex )
-As of May 18, 2006, USOF had 3,500,000 outstanding units. At that time, USOF owned 3,316 light, sweet crude oil futures contracts, which had a market value as of the close of trading that day of $232,584,240. USOF maintained cash deposits at USOF's custodian bank and margin with USOF's futures commission merchant in an aggregate amount of $232,796,908-