Unlike the previous IEA publication (2008a), in this current analysis toluene and xylene have not been included in the definition of HVCs. This value, shown in Table B.l, covers all steam cracker HVCs. The product of this value and the production volumes of HVCs results in a figure for the total BPT fuel use (in petajoules [PJ]) of steam crackers. The same calculation is repeated for steam, electricity and feedstock in order to calculate the total energy use of steam crackers.