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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?
如今的美國每加侖汽油的平均價格接近3.78美元。但是，為什么選擇用美元計算我們用在燃料上的開支呢？有沒有一種更切實的方式來計算每英里的成本？
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網站研究了聯邦機構的數據，最后得出結論：1981年3月（另一個高價位時期）時的每加侖汽油的平均價格相當于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年開車，你的實際行車里程可能更少。按照1981年的CAFE標準（即由政府規定的企業平均燃油經濟性要求），乘用車每加侖的行駛里程只有22英里。如果你達到了該規定的里程，每多行一里路，就要平均支付相當于2012 年的16.1美分的費用。
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的標準，乘用車每加侖的行駛里程達到了30.2英里。按照油價3.78美元計算，如果你達到了該規定的里程，每多行一里路，要平均支付12.5美分的費用。如此算來，每加侖汽油的價格并非就等于當時的油價。
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