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Proposal to align UN R115 with UN R83, replacing FCmean with FCnorm as defined in UN R101. FCmean, as defined in paragraphs 6.1.2.4.3.2. (LPG) and 6.2.2.4.3.2. (CNG) of UN Regulation No. 115, is the mean value of the fuel consumption of all the parent (test) vehicles, whereas the calculation of the gas ratio has to be made individually for each parent vehicle.