# Commission Regulation (EC) No 692/2008 of 18 July 2008 implementing and amending Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information (Text with EEA relevance), Division 2.3

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

Point 5.2.4 of UNECE Regulation No 101 shall be understood as:
(1) density: measured on the test fuel according to ISO 3675 or an equivalent method. For petrol, diesel, biodiesel and ethanol (E85 end E75), the density measured at 15 °C will be used; for LPG and natural gas/biomethane a reference density shall be used, as follows:
0,538 kg/litre for LPG,
0,654 kg/m 3 for NG (mean value of G20 and G23 reference fuels at 15 °C.)
(2) hydrogen-carbon-oxygen ratio: the following fixed values shall be used:
C 1 H 1,89 O 0,016 for petrol (E5),
C 1 H 1,93 O 0,033 for petrol (E10),
C 1 H 1,86 O 0,005 for diesel (B5),
C 1 H 1,86 O 0,007 for diesel (B7),
C 1 H 2,525 for LPG (liquefied petroleum gas),
CH 4 for NG (natural gas) and biomethane,
C 1 H 2,74 O 0,385 for ethanol (E85),
C 1 H 2,61 O 0,329 for ethanol (E75).

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Source: https://www.legislation.gov.uk/eur/2008/692/annex/XII/division/2/division/2.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2008-692/annex-XII/division-2/division-2.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.