The average Thursday for the first time since early 2005, according to a daily data of gas station credit card swipes.
Regular unleaded gasoline lost 1.4 cents to sell at a national average of $1.789 a gallon, down from $1.803 Sunday, according to motorist group AAA.
Prices are down 50% from the record high of $4.114 a gallon touched on July 17.
The national average gas price last hit $1.789 was Jan. 12, 2005.
Gas remains above $2 a gallon in only 3 states, according to AAA.
The average price in Alaska, the most expensive state, was $2.93 a gallon, while the average price was $2.92 in Hawaii, and $2.44 in New York. Gas was cheapest in Missouri, where it sold at an average price of $1.7 a gallon.
Diesel: The price of diesel gas, which is used in most trucks and commercial vehicles, has also dropped along with gasoline.
The price fell 2.8 cents Friday to a national average of $2.6 a gallon, according to the AAA results.
Diesel prices have dropped more than $2 a gallon as well, down from a record high of $4.845 on July 17.
Ethanol: Meanwhile the , turned higher, gaining 2.2 cents to $1.78 a gallon on average, AAA reported.
E85 can be substituted for regular gas in specially made "flex-fuel" vehicles, but is not freely accessible in some states.
