This should not be legal either, probably better bet to trade in the vice.
Crack Spread
$/barrel crude (42 Gallons) 1000barrels
$/gal HU & HO (42,000 Gallons)
3*cl 2*rb 1*ho
Spreads for price calc
CL*0.172-NG
HO*7.22-NG (trade 1NG to 1.7HO)
RB*42 - CL
HO*42 - CL
Trade is 1:1 contract for contract in HO/RB vs CL
Cracks now traded on platfrm as products in own right.