As a leader in heavy construction machinery, Carter excavator has always been the focus of attention of users in terms of operating efficiency and fuel economy. To explore the question of how much speed is the most fuel-efficient for Carter excavators, we first need to understand how the excavator works and the engine performance. Generally speaking, the fuel-efficient speed range of Carter excavators tends to be in the optimal torque output of the engine. Excessively high speeds will result in increased fuel consumption and may not improve efficiency, while excessively low speeds may not be sufficient for the proper operation of the equipment. According to relevant research and practice, the Carter excavator can not only give full play to the engine efficiency when working at medium speeds, but also achieve better fuel economy. However, the specific optimal speed value will be affected by various factors such as model, load size, operating environment, etc., it is recommended to refer to the operation manual of each model of excavator, and make reasonable adjustments and operations in combination with the actual situation. In order to achieve optimal fuel efficiency, in addition to focusing on speed control, it is also important to take measures such as regular maintenance, the use of high-quality fuel, and the optimization of operating habits. Therefore, for Carter excavator users, understanding and mastering the fuel-saving strategy suitable for their equipment can maximize economic benefits. In summary, the search for the most fuel-efficient speed of the Carter excavator is not a generalization, but needs to be flexibly responded to according to specific conditions, and strive to maximize fuel costs while ensuring operational efficiency, which is also the key to maximizing the value of the Carter excavator in the long-term operation process.