# Commission Implementing Decision (EU) 2018/2079 of 19 December 2018 on the approval of the engine idle coasting function as an innovative technology for reducing CO2 emissions from passenger cars pursuant to Regulation (EC) No 443/2009 of the European Parliament and of the Council (Text with EEA relevance), Division: Formula 2:

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

C CO 2 = B MC − E MC × UF MC The term UFMC of the Formula 2 will be hereafter simply written as ‘UF’ since it is the unique usage factor thanks to the previous simplification.
To determine BMC, the same modified testing conditions should be followed by a vehicle which does not have the coasting function.
The assumption is that the baseline vehicle is able to perform a sailing curve (line 2′ in Figure 2) without disconnecting the engine from the wheels, although with lower efficiency than a coasting vehicle (able to disconnect the engine from the wheels). Sailing is intended as the hypothetical coasting behaviour of the baseline vehicle.

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Source: https://www.legislation.gov.uk/eudn/2018/2079/annex/division/9/division/2 (the official version)
Page: https://openlegislation.uk/eu-decision-2018-2079/annex/division-9/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.