The two-month tumble in US gas prices shows no sign of slowing as fall approaches, which typically brings a seasonal drop in demand that experts say could push the national average below $3.50 a gallon.

Gas Prices

There is a chance that gas prices will fall into the fall.

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Arkansas has the lowest average price for a gallon of regular gasoline in the country at $3.42, followed by Mississippi, Georgia and Texas, which all have an average price of $3.44.

Other sub-$3.50 clubs include Tennessee, Louisiana, South Carolina, Missouri, Alabama, and Kansas.

The price of gas in Kentucky could fall below $3.50 by Sunday.

The national average price for a gallon of gas is $3.91.

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Some rural counties in Hawaii and California sell gas for more than $6 a gallon. In California's Alpine County, which straddles the Nevada border, the average price for a gallon of gas is $6.80, while in Mono County it's $6.50. The average price of gas in Nevada is $6.32 per gallon.

Key Background

The average price for a gallon of gas in the US was $5.02 in the first half of the year. The price of crude oil shot up due to factors such as declining U.S. refining capacity and an embargo on Russian oil. The sky-high prices have collapsed due to weak demand and fears of a recession. Patrick De Haan of GasBuddy said on Friday that prices "almost always" go down in the fall.

Here are the states where gas prices are the most expensive and cheapest.

$3 gas is a possibility.

Here are the states where gas prices are already cheaper.