# 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 3.3

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

In Annex 6 of UN/ECE Regulation 101, section 1.4.3 shall be replaced by the following:
1.4.3. The fuel consumption, expressed in litres per 100 km (in the case of petrol (E5/E10), LPG, ethanol (E85) and diesel (B5/B7)), in m 3 per 100 km (in the case of NG/biomethane and H 2 NG) or in kg per 100 km (in the case of hydrogen) is calculated by means of the following formulae:
(a) for vehicles with a positive ignition engine fuelled with petrol (E5):
FC = 0,118 ∕ D × 0,848 × HC + 0,429 × CO + 0,273 × CO 2
(b) for vehicles with a positive ignition engine fuelled with petrol (E10):
FC = 0,120 ∕ D × 0,830 × HC + 0,429 × CO + 0,273 × CO 2
(c) for vehicles with a positive ignition engine fuelled with LPG:
FC norm = 0,1212 ∕ 0,538 × 0,825 × HC + 0,429 × CO + 0,273 × CO 2
If the composition of the fuel used for the test differs from the composition that is assumed for the calculation of the normalised consumption, on the manufacturer’s request a correction factor cf may be applied, as follows:
FC norm = 0,1212 ∕ 0,538 × cf × 0,825 × HC + 0,429 × CO + 0,273 × CO 2
The correction factor cf, which may be applied, is determined as follows:
cf = 0,825 + 0,0693 n actual
where:
n actual the actual H/C ratio of the fuel used
(d) for vehicles with a positive ignition engine fuelled with NG/biomethane:
FC norm = 0,1336 ∕ 0,654 × 0,749 × HC + 0,429 × CO + 0,273 × CO 2
(e) for vehicles with a positive ignition engine fuelled with ethanol (E85):
FC = 0,1742 ∕ D × 0,574 × HC + 0,429 × CO + 0,273 × CO 2
(f) for vehicles with a compression ignition engine fuelled with diesel (B5):
FC = 0,116 ∕ D × 0,861 × HC + 0,429 × CO + 0,273 × CO 2
(g) for vehicles with a compression ignition engine fuelled with diesel (B7):
FC = 0,116 ∕ D × 0,859 × HC + 0,429 × CO + 0,273 × CO 2
(h) for vehicles with a positive ignition engine fuelled by H 2 NG:
FC = 910,4 × A + 13600 44,655 × A 2 + 667,08 × A 7,848 × A 9,104 × A + 136 × HC + 0,429 × CO + 0,273 × CO 2
(i) for vehicles fuelled by gaseous hydrogen:
FC = 0,024 × V d × 1 Z 2 × p 2 T 2 − 1 Z 1 × p 1 T 1
Under previous agreement with the type-approval authority, and for vehicles fuelled either by gaseous or liquid hydrogen, the manufacturer may choose as alternative to the method above, either the formula
FC = 0,1 × 0,1119 × H 2 O + H 2
or a method according to standard protocols such as SAE J2572.
In these formulae:
FC the fuel consumption in litre per 100 km (in the case of petrol, ethanol, LPG, diesel or biodiesel) in m 3 per 100 km (in the case of natural gas and H 2 NG) or in kg per 100 km in the case of hydrogen.
HC the measured emission of hydrocarbons in g/km
CO the measured emission of carbon monoxide in g/km
CO 2 the measured emission of carbon dioxide in g/km
H 2 O the measured emission of H 2 O in g/km
H 2 the measured emission of H 2 in g/km
A quantity of NG/biomethane within the H 2 NG mixture, expressed in per cent volume
D the density of the test fuel.
In the case of gaseous fuels D is the density at 15 °C.
d the theoretical distance covered by a vehicle tested under the type 1 test in km.
p 1 pressure in gaseous fuel tank before the operating cycle in Pa;
p 2 pressure in gaseous fuel tank after the operating cycle in Pa;
T 1 temperature in gaseous fuel tank before the operating cycle in K.
T 2 temperature in gaseous fuel tank after the operating cycle in K.
Z 1 compressibility factor of the gaseous fuel at p 1 and T 1
Z 2 compressibility factor of the gaseous fuel at p 2 and T 2
V inner volume of the gaseous fuel tank in m 3
The compressibility factor shall be obtained from the following table:
T(k) p(bar)\
33
53
73
93
113
133
153
173
193
213
233
248
263
278
293
308
323
338
353
5
0,8589
0,9651
0,9888
0,997
1,0004
1,0019
1,0026
1,0029
1,003
1,0028
1,0035
1,0034
1,0033
1,0032
1,0031
1,003
1,0029
1,0028
1,0027
100
1,0508
0,9221
0,9911
1,0422
1,0659
1,0757
1,0788
1,0785
1,0765
1,0705
1,0712
1,0687
1,0663
1,064
1,0617
1,0595
1,0574
1,0554
1,0535
200
1,8854
1,4158
1,2779
1,2334
1,2131
1,199
1,1868
1,1757
1,1653
1,1468
1,1475
1,1413
1,1355
1,13
1,1249
1,1201
1,1156
1,1113
1,1073
300
2,6477
1,8906
1,6038
1,4696
1,3951
1,3471
1,3123
1,2851
1,2628
1,2276
1,2282
1,2173
1,2073
1,1982
1,1897
1,1819
1,1747
1,168
1,1617
400
3,3652
2,3384
1,9225
1,7107
1,586
1,5039
1,4453
1,4006
1,3651
1,3111
1,3118
1,2956
1,2811
1,2679
1,2558
1,2448
1,2347
1,2253
1,2166
500
4,0509
2,7646
2,2292
1,9472
1,7764
1,6623
1,5804
1,5183
1,4693
1,3962
1,3968
1,3752
1,3559
1,3385
1,3227
1,3083
1,2952
1,283
1,2718
600
4,7119
3,1739
2,5247
2,1771
1,9633
1,819
1,715
1,6361
1,5739
1,4817
1,4823
1,4552
1,4311
1,4094
1,3899
1,3721
1,3559
1,341
1,3272
700
5,3519
3,5697
2,8104
2,4003
2,1458
1,973
1,8479
1,7528
1,6779
1,5669
1,5675
1,535
1,5062
1,4803
1,457
1,4358
1,4165
1,3988
1,3826
800
5,973
3,9541
3,0877
2,6172
2,3239
2,1238
1,9785
1,8679
1,7807
1,6515
1,6521
1,6143
1,5808
1,5508
1,5237
1,4992
1,4769
1,4565
1,4377
900
6,5759
4,3287
3,3577
2,8286
2,4978
2,2714
2,1067
1,9811
1,882
1,7352
1,7358
1,6929
1,6548
1,6207
1,59
1,5623
1,537
1,5138
1,4926
In the case that the needed input values for p and T are not indicated in the table, the compressibility factor shall be obtained by linear interpolation between the compressibility factors indicated in the table, choosing the ones that are the closest to the sought value.

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Source: https://www.legislation.gov.uk/eur/2008/692/annex/XII/division/3/division/3.3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2008-692/annex-XII/division-3/division-3.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.