The average price of self-serve gasoline dropped 22 cents in the past two weeks, said Trilby Lundberg, publisher of the Lundberg Survey.
The average, tallied on Friday, was the lowest since the $1.74 average on March 12, 2004, Lundberg said.
Lundberg attributed the price reductions to a drop in crude prices and demand. Prices could drop more if the global economic crisis continues to affect demand for crude oil.
The all-time high average was $4.11, set on July 11, according to Lundberg.
The Lundberg Survey is based on responses from more than 5,000 service stations nationwide.
Drivers in Cheyenne, Wyoming, had the cheapest gas prices, paying $1.46 on average. Motorists in Anchorage, Alaska, paid the most, at $2.54 on average.
Here are average prices in other cities:
Detroit, Michigan -- $1.61
El Paso, Texas -- $1.81
Atlanta, Georgia -- $1.72
Salt Lake City, Utah -- $1.58
Manchester, New Hampshire -- $1.76
Miami, Florida -- $1.87
Los Angeles, California -- $1.83Portland, Oregon -- $1.93