This paper analyzes and calculates the current fuel consumption standards for light-duty commercial vehicles in China, revealing the problems existing in the current national standard (GB 20,997–2015) and the ideas for optimization in the next phase. It also serves as a reasonable interpretation of the modifications made to the national standard in the next phase. The main arguments include: the current standards are not applicable in five aspects, matching of test methods, evaluation criteria, curve of limit, management path, and target. In coordination with the new version of test methods, the next phase of the national standard will be based on test mass and formulated in a linear manner. Based on the fitting of fuel consumption trends under different test methods, the fuel consumption conversion relationship was established, and the fuel consumption requirements under the new test method with the same level of rigor as the current standard were obtained. Balancing the management focus between limits and corporate average fuel consumption (shorten as CAFC), proposing fuel consumption requirements under two supporting management paths. Establishing a mathematical model for CAFC compliance paths, providing references for future automotive production corporates’ fuel consumption compliance.