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Missouri became the first state Friday to have an average statewide gas price fall below $2 per gallon since 2009, while Oklahoma's average was expected to drop below that threshold sometime over the weekend, according to AAA.

The national average gas price was at $2.32 per gallon Friday, which AAA spokesman Michael Green said was the lowest since May 2009. That average has dropped for 92 days in a row, he said, which is the longest streak since AAA started keeping daily records in January 2000.

Gas prices have fallen every day since Sept. 25, for a total of $1.02 per gallon, Green said. "The steady decline in gas prices this autumn is unlike anything we have previously tracked," he said.

Missouri's average on Friday morning was $1.98, according to AAA. Oklahoma had the second-lowest average at $2.01 and "is likely to drop below that price point this weekend," Green said. Kansas had the third-lowest statewide average at $2.06 per gallon, while Texas and Indiana each averaged $2.09, Green said.

Gas prices are about 94 cents a gallon lower than they were a year ago, and AAA estimates consumers nationwide are saving more than $450 million per day on gasoline compared with the highs of spring and summer this year. The slide is expected to continue in the short term.

— The Associated Press