I. Project Background and Procurement Requirements In 2025, a municipal sanitation department in a district of Suzhou (hereinafter referred to as the 'Procuring Entity') urgently needed to procure a batch of yellow-plate sewage treatment vehicles due to aging local sewage treatment facilities and insufficient processing capacity. These vehicles were required for routine sewage suction, transportation, and emergency response. The procurement budget was capped at approximately RMB 419,000 per unit (based on publicly available tender information), with mandatory requirements including China VI emission compliance, a high-efficiency vacuum pump system, a large-capacity sewage tank, and adaptability to flexible dispatching in narrow urban roads. After multiple rounds of tendering and solution comparisons, Chengli Special Purpose Vehicle Co., Ltd. (hereinafter 'Chengli') successfully delivered five units of its CLW5070GSSD6 yellow-plate sewage treatment vehicle (built on the Dongfeng 3308 chassis). This article provides an operational performance review of this model from the perspective of the fleet management supervisor. II. Fleet Management Supervisor’s Evaluation: Dispatch Flexibility and Adaptability "Initially, we were concerned that yellow-plate vehicles would be inconvenient for urban operations—but in practice, Chengli’s sewage treatment vehicle based on the Dongfeng 3308 chassis has proven highly maneuverable, easily navigating into old residential communities and narrow streets," said Mr. Li, Fleet Management Supervisor of the Procuring Entity, during a quarterly review meeting. The vehicle adopts the Dongfeng 3308 chassis, with a wheelbase of 3,308 mm and an overall length under 6 meters—fully compliant with minimum road-width requirements for yellow-plate vehicles. Coupled with Chengli’s custom-built upper-body system, the tank capacity is approximately 4.5 m³ (per official CLW5070GSSD6 type-approval parameters), balancing sufficient single-operation volume against excessive length that could hinder dispatch efficiency. Mr. Li added: "Our daily schedules are fully packed—we must complete suction operations at three locations before morning rush hour; switching vehicles simply isn’t feasible. With this vehicle, startup to job-site positioning takes no more than 15 minutes." Additionally, the vehicle’s vacuum pump system supports remote operation, enabling operators to perform suction and discharge tasks directly from inside the cab—significantly reducing workers’ exposure to sewage. Field feedback indicates a ~20% improvement in single-operation efficiency compared to previous models. III. Fuel Consumption Monitoring Data and Operational Costs Following delivery, the Procuring Entity monitored fuel consumption for three units over a three-month period (July–September 2025), yielding the following data: | Vehicle ID | Total Distance Traveled (km) | Total Fuel Consumption (L) | Avg. Fuel Consumption (L/100 km) | Operating Days | Notes | |------------------|------------------------------|----------------------------|------------------------------------|----------------|--------------------------------------------| | SuE-3308-01 | 4,820 | 1,350 | 28.0 | 78 | Includes 18 days of high-load operation | | SuE-3308-02 | 4,560 | 1,280 | 28.1 | 75 | Includes 12 nighttime emergency operations | | SuE-3308-03 | 4,910 | 1,410 | 28.7 | 80 | Includes 22 days of continuous suction | | **Average** | **4,763** | **1,347** | **28.3** | **77.7** | — | Data shows that under full-load operating conditions—in