(LOS ANGELES TIMES) — Last month turned out to be the most expensive January ever at U.S. gasoline pumps, boosted by growing economic strength.

January is typically a month of falling gasoline prices because fuel demand falters in the slower travel weeks that follow the year-end holidays.

Not so this year.

In January, retail gasoline prices averaged $3.37 a gallon, according to the Oil Price Information Service, a private fuel information service. That compared with the previous record average for the month of $3.095 a gallon, set last year. In 2010, January gasoline prices averaged just $2.71 a gallon.

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