An excerpt from Valero's 3rd qtr earnings perview:

"Regarding ethanol operation in the third quarter, the company expects total throughput volumes of 2.2 million gallons per day and operating expenses should average approximately $0.30 per gallon, including $0.03 per gallon for non-cash costs such as depreciation and amortization."

http://www.istockanalyst.com/article/vie...

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So for Valero, any crush above 33 cents/gal is net pre-tax profit. I'm guessing RSC's operating costs per gallon run well below Valero's.