它减少了石油消费量和磨损，同时提高燃油经济性。
It reduces oil consumption and wear, while improving fuel economy.
这样一来就只能通过改进发动机来提高燃油经济性了。
Which leaves engines as the best way to improve fuel economy.
然而，他们似乎违反了在既定的规则，能源发电机是从提高燃油经济性。
However, they do appear to violate the established rules in that energy from an alternator is improving fuel economy.
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