The 3-2-1 crack spread compares the acquisition cost of three barrels of crude with the selling price of two barrels of gasoline and one barrel of diesel.
1裂解价差的比较对象是，购买三桶原油的成本与两桶汽油和一桶柴油售价之差。
2
Other popular indicators are the 5-3-2 crack (five barrels of crude, three barrels of gasoline and two barrels of diesel) and the 2-1-1 crack (two crude, one gasoline and one diesel).
Refining markers published by BP and Valero as well as the generic crack spreads calculated from futures prices are all for the gross margin obtained from turning crude into products.