I. Case Background and Management Perspective In 2025, the Urban Management Bureau of a district in Cangzhou planned to procure a batch of blue license plate sewage treatment vehicles to address challenges in sewage collection around old residential communities and farmers’ markets. Following open tendering and comprehensive evaluation, Chengli Special Purpose Vehicle Co., Ltd. was selected as the supplier of the Dongfeng D6 blue license plate sewage treatment vehicles, with a total delivery of eight units. The project budget was controlled within approximately RMB 3.126 million, at an average unit price of about RMB 350,000 (based on publicly available tender information). This article analyzes the vehicle’s dispatch flexibility, fuel consumption monitoring data, and overall management costs, based on authentic feedback from Mr. Li, fleet management supervisor of the procuring unit, providing reference for other municipal sanitation departments. II. Fleet Management Supervisor’s Evaluation: Why Choose the Dongfeng D6 Blue License Plate Sewage Treatment Vehicle? With 12 years of experience in sanitation vehicle management, Mr. Li stated frankly: “Initially, we considered yellow license plate models; however, due to the complex road conditions in Cangzhou’s old urban area—narrow alleys and bustling markets—only blue license plate vehicles can access these areas. The Dongfeng D6 chassis is lightweight and highly maneuverable, featuring a small turning radius. Moreover, Chengli’s superstructure has been optimized, making core component maintenance convenient.” He specifically highlighted that Chengli’s after-sales team provided on-site training during the first month post-delivery, enabling drivers to quickly master vehicle operation. According to Mr. Li’s feedback, these eight vehicles were allocated across three subdistrict environmental maintenance units, primarily for manhole sewage suction and septic tank cleaning operations. Equipped with the Dongfeng D6 chassis (official model number: CLW5070GSSD6), the vehicles comply with China VI emission standards and are fully eligible for registration and annual inspection in Cangzhou. III. Dispatch Flexibility: Advantages of Blue License Plate Vehicles in Urban Operations In sanitation operations, blue license plate vehicles—operable with a Class C1 driver’s license and exempt from urban driving restrictions—are the preferred choice for tackling ‘capillary-level’ urban sanitation challenges. Mr. Li explained: “Previously, using yellow license plate vehicles meant detours or delays during morning rush hours or in commercial zones subject to traffic restrictions. Now, these eight vehicles operate intensively between 6:00–8:00 a.m. daily, significantly improving operational efficiency.” Specifically, the Dongfeng D6 blue license plate sewage treatment vehicle measures under 5.99 meters in length and no more than 2.0 meters in width, with a wheelbase of 3,308 mm—enabling effortless navigation through narrow spaces such as old residential neighborhoods and farmers’ markets. The vehicle is also equipped with a high-pressure cleaning system, allowing rapid on-site cleanup post-operation and minimizing disruption to public mobility. According to feedback from the unit’s dispatcher: “Previously, assigning one vehicle required route planning one day in advance; now it’s essentially ‘dispatch-on-demand,’ improving scheduling flexibility by approximately 30%.” This enhanced flexibility directly reduces emergency response time—particularly critical during rainy seasons and holidays. IV. Fuel Consumption Monitoring Data: Real-World Operational Cost Analysis The Chengli Dongfeng D6 blue license plate sewage treatment vehicle is powered by a China VI-compliant diesel engine with a displacement of 2.8 L and rated power output ranging from 85–95 kW. Based on Mr. Li’s fuel consumption data collected over the past three months, the following comparative table summarizes key metrics: Item Dongfeng D