Assessing the Real-World Performance of Yangzhou's Sewage Treatment Vehicles Through a Procurement Report: In early 2026, a district Urban Management Bureau in Yangzhou procured a batch of National VI Dongfeng 3308 mm wheelbase sewage treatment vehicles to support its aging urban sewer network renovation project. As fleet management lead for this project, I participated fully in vehicle selection, acceptance, and operational follow-up. The following evaluation is based on real-world usage data and presented objectively for peer reference. I. Project Background and Selection Rationale The district’s jurisdiction includes over 20 old residential communities; their sewer pipelines are severely deteriorated. Conventional vacuum trucks suffer from low efficiency and frequent clogging. After multiple rounds of tendering, CLW Special Purpose Vehicle Co., Ltd. was selected to supply the CLW5070GSSD6 model sewage treatment vehicle. This model features a National VI Dongfeng chassis with a 3308 mm wheelbase; official certification parameters indicate an effective tank capacity of approximately 3.5 m³, equipped with a high-pressure cleaning system and a sewage separation unit. Three key criteria guided the selection: 1) Chassis universality: Dongfeng chassis enjoy dense local service coverage, ensuring convenient maintenance; 2) Upper-structure configuration: Chengli’s sewage separation system reduces off-site transport frequency; 3) Cost control: Based on publicly available tender information, the unit price of this model is approximately RMB 280,000, well within the budget ceiling of RMB 327,000—representing a saving of about RMB 14,000 compared to equivalent configurations offered through authorized 4S dealerships. Project Delivery and Operational Flexibility In January 2026, the first batch of six vehicles was delivered. Chengli completed integrated chassis–body commissioning per contract requirements and dispatched technical personnel for three days of on-site operator training. In actual operations, the vehicles demonstrated outstanding dispatch flexibility: • High maneuverability: The 3308 mm wheelbase enables access to narrow alleys in old urban districts; turning radius is approx. 6.5 meters—ideal for intra-community operations. • Multi-functionality: By switching between high-pressure cleaning and vacuum suction modes, each vehicle independently performs pipeline unclogging, sewage collection, and preliminary separation—eliminating redundant equipment investment. • Rapid response: Nationwide Dongfeng warranty coverage ensures service technicians arrive within two hours of fault reporting (Dongfeng service stations cover all of Yangzhou); Chengli guarantees lifetime support for upper-structure components, with spare parts shipped directly within 24 hours. II. Fuel Consumption Monitoring Data and Operational Cost Analysis Each vehicle was fitted with BeiDou positioning and fuel consumption monitoring systems. Data collected over three months (February–April 2026) yielded the following average performance metrics across the six units: Metric Data Notes Average daily mileage ~45 km Including round-trip travel between operation sites and transfer stations Average fuel consumption per 100 km 12.8 L National VI engine under heavy-load operating conditions Average daily fuel cost ~RMB 48 Calculated at current diesel price of RMB 7.5/L Average operation time per task ~2.5 hours Including both suction and cleaning procedures Sewage separation efficiency ~85% Reduces off-site transport frequency by 30% Notably, the onboard sewage separation unit reduced off-site transport trips from twice daily to 1.4 times daily—directly lowering transportation and treatment expenses. Compared to conventional vacuum trucks of equivalent capacity, monthly operational costs decreased by approximately 15%. Per local procurement practice, fuel and maintenance account for ~40% of total lifecycle cost (five years) for such vehicles; Chengli’s upper-stru