有效燃油消耗率有一定的上升，但不是十分明显；
The specific fuel consumption is up to a certain extent, but not evident;
汽油机燃烧稀混合气是降低有害尾气排放、燃油消耗率的有效途径。
Lean burn mixture combustion of gasoline engine is an effective approach for reducing emissions and fuel consumption.
简要介绍了一种新型的汽油机的稀薄燃烧系统，可以有效地降低燃油消耗率和废气排放。
This paper briefly introduces a new lean combustion system which can effectively reduce fuel consumption rate and exhaust emissions.
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