I. Procurement Background and Management Perspective Evaluation In autumn 2024, a municipal sanitation department—facing aging urban drainage networks and a sharp increase in sludge removal workload—urgently needed to procure a batch of specialized sludge suction vehicles. After multiple rounds of market research and open tendering, it ultimately selected the Dongfeng dual-cab sludge suction truck manufactured by Chengli Special Purpose Vehicle Co., Ltd., model: blue license plate, 3-cubic-meter capacity. Two units were procured, with a total budget controlled at approximately RMB 277,000 (per publicly available tender information), i.e., about RMB 125,000 per unit. Built upon a Dongfeng chassis, the vehicle features a dual-cab configuration accommodating 5–6 operators and is equipped with a 3-cubic-meter sludge collection tank—ideal for narrow streets and internal residential community operations. As head of fleet management for this department, Engineer Zhang (a pseudonym) provided an objective assessment after taking delivery: “We’ve previously used sludge suction trucks from other brands, but the Dongfeng dual-cab model stands out notably in dispatch flexibility and fuel efficiency control. Particularly, its blue license plate classification allows operation with a Class C1 driver’s license—eliminating the need to hire additional Class A drivers and significantly reducing labor costs. Moreover, Chengli’s lifetime after-sales service for the superstructure gives us great confidence; the Dongfeng chassis enjoys nationwide warranty coverage, and spare parts are readily available.” This procurement strictly followed government procurement procedures. Chengli Special Purpose Vehicle provided complete official technical specifications and the winning bid proposal, ensuring seamless local registration, annual inspection, and operational licensing for the vehicles. Per local procurement practice, the winning supplier was required to submit full documentation—including the official vehicle announcement, chassis certificate of conformity, and environmental compliance information—all of which Chengli delivered punctually without omission. II. Dispatch Flexibility: Blue License Plate Advantages and Scenario Adaptability Sludge removal operations typically require frequent site transfers—especially in historic urban districts and narrow alleys where large vehicles cannot access. The blue license plate Dongfeng dual-cab sludge suction truck excels here, thanks to its compact dimensions (approx. 5.5 m × 1.9 m × 2.2 m) and small turning radius (~6.5 m), enabling agile maneuvering on confined roads. Engineer Zhang noted: “Previously, our yellow-plate vehicles couldn’t enter many residential compounds or alleyways, forcing manual sludge transport—greatly reducing efficiency. Now, these two blue-plate units cover over 80% of all operational sites across the city.” The dual-cab design accommodates five operators simultaneously, eliminating the need for separate staff transport vehicles. During emergency dispatches, the vehicle responds rapidly: average response time—from receiving instruction to arriving on-site—has decreased by ~30%. Although the 3-cubic-meter sludge tank has modest capacity, when integrated with the high-pressure cleaning system, it enables ‘clean-and-transport-in-one-go’, minimizing secondary pollution. In practice, clearing a standard manhole takes ~40 minutes—nearly three times faster than manual methods. According to Chengli’s product database (e.g., similar model CLW5070GSSD6), this sludge suction truck is powered by a Quanchai 95-hp engine delivering peak torque of 240 N·m—providing ample power for light urban flooding and muddy road conditions. Its Dongfeng OEM chassis features a dual-circuit air-braking system, ensuring safety and reliability. Overall, dispatch flexibility is a key factor that distinguished this model in the government procurement process. III. Fuel Consumption Monitoring Data: Real-World Usage vs