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Mercedes recommends 91-octane fuel, but the per-gallon difference of 15 to 20 cents seems a high price to pay for a grade that is only two octane levels higher than regular.
WSJ: Is Regular Gas Good Enough?
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。