Proposal to amend para. 6.1.10. to address division by zero cases when an OVC-HEV consumes zero fuel under charge-depleting conditions by applying good engineering judgement, and amend Annex B8, para. 4.2.2. to modify the charge-depleting fuel efficiency calculation formula for OVC-HEVs and OVC-FCHVs under Level 1B, incorporating treatment of zero fuel consumption cases. The amendments prevent invalid calculations and ensure robustness of WLTP-based methods, addressing limitations in exhaust gas analysis equipment that cause cycle “n” to contain mixed Charge Depleting and Charge Sustaining operation.