Americans cut their driving by more than 112 billion miles over the past 13 months, as the weak economy kept drivers off roads despite lower fuel prices, according to the Federal Highway Administration.

The falling number of miles dwarfs the 49.9 billion decline in the 1970s, a decade characterized by high gas prices, fuel shortages and a recession.

November's decline of 12.9 billion miles, or 5.3%, was the largest for the month since the estimates began in 1971.

Spokesman Doug Hecox said it had been thought that gas prices were the main reason driving levels decreased, but new data suggested that other factors including unemployment and a decline in housing prices were affecting driving patterns.

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