# Commission Regulation (EU) No 582/2011 of 25 May 2011 implementing and amending Regulation (EC) No 595/2009 of the European Parliament and of the Council with respect to emissions from heavy duty vehicles (Euro VI) and amending Annexes I and III to Directive 2007/46/EC of the European Parliament and of the Council (Text with EEA relevance), Division 2.2: The atomic ratios set out in Section 5.3.7.3 shall be understood as follows:

Extent: E+W+S+N.I.

Hcv Atomic ratio of hydrogen to carbon
for petrol (E10) 1,93
for LPG 2,525
for NG/biomethane 4,0
for ethanol (E85) 2,74
Ocv Atomic ratio of oxygen to carbon
for petrol (E10) 0,032
for LPG 0,0
for NG/biomethane 0,0
for ethanol (E85) 0,385

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Source: https://www.legislation.gov.uk/eur/2011/582/annex/IV/division/2/division/2.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2011-582/annex-IV/division-2/division-2.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.