Correction: NWE premium gasoline crack swaps Mar 3, 4, 7

Premium unleaded gasoline crack swaps for March 3, 4 and 7 have been corrected.

The correct assessments are as follows:

(FS0615) 615--Premium unleaded crack swaps: Mar 03 (CORRECTION) Prem crack Low/High Mid Price $/bbl Assessment Point Change Q2 2011 +9.35/+9.45 +9.400 +0.700 Q3 2011 +8.65/+8.75 +8.700 +0.250 Q4 2011 +4.55/+4.65 +4.600 +0.100 Q1 2012 +6.05/+6.15 +6.100 +0.000

(FS0615) 615--Premium unleaded crack swaps: Mar 04 (CORRECTION) Prem crack Low/High Mid Price $/bbl Assessment Point Change Q2 2011 +9.55/+9.65 +9.600 +0.200 Q3 2011 +8.85/+8.95 +8.900 +0.200 Q4 2011 +4.55/+4.65 +4.600 +0.000 Q1 2012 +6.15/+6.25 +6.200 +0.100

(RRRR)

(FS0615) 615--Premium unleaded crack swaps: Mar 07 (CORRECTION) Prem crack Low/High Mid Price $/bbl Assessment Point Change Q2 2011 +8.95/+9.05 +9.000 -0.600 Q3 2011 +8.25/+8.35 +8.300 -0.600 Q4 2011 +4.10/+4.20 +4.150 -0.450 Q1 2012 +6.15/+6.25 +6.200 +0.000