37. The Chair of the informal group on Gaseous Fuelled Vehicles (GFV) introduced: (i) ECE/TRANS/WP.29/GRPE/2013/7, a proposal to amend the 05 series of amendments of UN Regulation No. 49 to extend the Euro V pollutant emission requirements to dual-fuel heavy duty engines and vehicles; and (ii) GRPE-66-25 (presented concisely in GRPE-66-39), a revision of the calculation methods also in use for the Euro VI dual-fuel engines, an update of hydrocarbon emission limits and some editorial modifications.