I. Project Background and Requirements Analysis A municipal sanitation department announced a procurement plan for blue license plate, 5-cubic-meter sewer cleaning trucks at the end of 2025, intended for cleaning urban drainage networks, culverts, and river channels. According to publicly released tender information, the budget is capped at approximately RMB 168,000. Key requirements include: operability with a Class C1 driver’s license, low curb weight, excellent maneuverability, and high cleaning efficiency. After multiple rounds of evaluation, the selected solution combines a Dongfeng single-cab chassis with Chengli’s superstructure — three units were delivered. The tender documents explicitly stipulate that the engine must comply with China VI emission standards, deliver a minimum power output of 85 kW, and be capable of reliable operation under Baoding’s winter low-temperature and summer heavy-rain conditions. Chengli Special Automobile Co., Ltd. (located in Chengli Automobile Industrial Park, Economic Development Zone, Suizhou City, Hubei Province) was shortlisted as a preferred bidder, owing to its comprehensive official vehicle announcement parameters and localized service capabilities. II. Engine Comparison Analysis: Differences Among 85 kW / 100 kW / 120 kW Options Sewer cleaning trucks frequently operate at low speeds in confined, low-lying, or muddy environments—placing high demands on engine torque output and fuel economy. Chengli’s Dongfeng single-cab, blue license plate, 5-cubic-meter sewer cleaning truck — based on the official model CLW5070GSSD6 (reference chassis) — offers compatibility with engines across multiple power ratings. Below is a comparative overview of the three mainstream power options: Parameter 85 kW (~115 HP) 100 kW (~136 HP) 120 kW (~163 HP) Rated Power (kW) 85 100 120 Maximum Torque (N·m) ~320 ~380 ~450 Displacement (L) 2.8–3.0 3.0–3.8 3.8–4.5 Fuel Consumption (L/100 km, fully loaded operation) ~12–14 ~14–16 ~16–19 Typical Application Scenarios Flat urban areas, light-duty cleaning Hilly terrain, medium-load operations Mountains, plateaus, heavy-load operations Price Impact (Reference) Base configuration; lower cost by ~RMB 8,000–12,000 Mainstream configuration; optimal balance of performance and cost High-power configuration; higher cost by ~RMB 15,000–20,000 85 kW Engine: For a blue license plate, 5-cubic-meter sewer cleaning truck, an 85 kW engine provides ample power for urban road use and routine cleaning tasks, while delivering the lowest fuel consumption. Customer feedback indicates that, under typical operational conditions in Baoding’s flat terrain, fuel consumption remains around 13 L per 100 km — making it ideal for budget-constrained procurement projects. 100 kW Engine: Where cleaning zones involve inclines or frequent start-stop cycles, the 100 kW engine delivers superior power reserve with only a marginal increase in fuel consumption. In most government procurement cases, the 100 kW option has become the preferred choice, striking an optimal balance between performance and cost-effectiveness. 120 kW Engine: Best suited for plateau or mountainous operations — e.g., Sichuan or Yunnan provinces. However, in Baoding’s flat terrain, this power rating is excessive and results in significantly higher fuel consumption, negatively impacting long-term operational cost control. III. Fuel Consumption Comparison and Altitude/Plain Adaptability Based on real-world application data provided by Chengli (drawn from CLW5070GSSD6 and similar models), under full-load conditions (5 cubic meters of sludge) and urban driving conditions (frequent traffic lights, low-speed operation),