六、保持经济车速和按规定装载经济车速一般为各型车辆最高车速的60％左右。掌握经济车速行驶节油的关键，是在平路上应尽可能保持高速档或直接档稳速前进；在爬坡时．则应尽可能地利用最大扭矩时的车速行驶。在正常行驶中．油门开度大小与车速有着密切关系．正确掌握油门开度 Sixth, to maintain the economic speed and economic loading speed in accordance with the regulations for the various types of vehicles is generally about 60% of the maximum speed. To master the economic fuel-efficient driving speed is the key, in the flat road should be as high as possible to maintain high gear or direct file steady forward; climbing. It should be possible to use the maximum speed of the vehicle speed driving. In normal driving. Throttle size and speed are closely related. Correctly grasp the throttle opening