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The average price for a gallon of gas in the U.S. today was nearly $3.78 per gallon. But why do we calculate fuel expenditure in dollars per gallon? Wouldn’t a more realistic figure be cost per mile?
如今的美国每加仑汽油的平均价格接近3.78美元。但是，为什么选择用美元计算我们用在燃料上的开支呢？有没有一种更切实的方式来计算每英里的成本？
The Web site zfacts.com used a collection of federal agency figures to determine that the average price of a gallon of gasoline in March of 1981, another high-price period, was the equivalent to $3.55 in 2012 money.
zfacts.com网站研究了联邦机构的数据，最后得出结论：1981年3月（另一个高价位时期）时的每加仑汽油的平均价格相当于2012年的3.55美元。
But if you were driving in 1981, your car probably got lousy mileage. In 1981 the CAFE standard, that is the corporate average fuel economy requirement set by the government, was just 22 miles per gallon for passenger cars. If you actually got that mileage, you paid the 2012 equivalent of, on average, 16.1 cents to go a mile.
但是，如果你是在1981年开车，你的实际行车里程可能更少。按照1981年的CAFE标准（即由政府规定的企业平均燃油经济性要求），乘用车每加仑的行驶里程只有22英里。如果你达到了该规定的里程，每多行一里路，就要平均支付相当于2012 年的16.1美分的费用。
Today, CAFE standards are up to 30.2 miles per gallon. If you actually get that mileage, with gas at $3.78, you are paying 12-and-a-half cents to go a mile. The price per gallon isn't necessarily the price of gas.
如今，按照CAFÉ的标准，乘用车每加仑的行驶里程达到了30.2英里。按照油价3.78美元计算，如果你达到了该规定的里程，每多行一里路，要平均支付12.5美分的费用。如此算来，每加仑汽油的价格并非就等于当时的油价。
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