The cost of a gallon of gas keeps falling despite a tumultuous period for oil prices after Hamas launched an attack on Israel earlier this month.

The national average for regular unleaded fell about 3 cents to $3.60 -- from $3.628 on Friday, -- according to AAA, a nonprofit federation of motor clubs that tracks fuel costs. The decline comes as oil hovers around $90 per barrel. The price of crude, which is refined into gasoline, makes up more than half the price of a gallon of fuel.

Oil prices rose after Hamas' surprise attack on Israel 10 days ago, but the spike was far less than the roughly $40 per barrel temporary surge following last year’s invasion of Ukraine by Russia, AAA says. The critical difference is that Russia is a significant oil producer, while Israel and the Palestinian territories are not, it said.

“As long as this war does not spread to include more countries in the region, the effect on the oil market will remain muted,” AAA spokesperson Andrew Gross said in a statement.

Why are gas prices going down?

At a statewide average of $5.621 a gallon, Californians may not feel much relief at the pump. But prices are lower, down more than 18 cents from a week earlier, from $5.804, AAA says.

Pump prices are dropping in the Golden State, as they are in the rest of the country, because of lower demand from drivers and less expensive blends of winter gasoline coming into the market. California introduced its winter blend earlier than usual this year, and it contains a larger amount of a cheaper ingredient that helps cars start at lower temperatures. Typically, California doesn't make the switch until the end of October. Winter blend gas can shave 15 to 20 cents off a gallon of gas, said Doug Shupe, AAA spokesperson in California.

Why is gas so expensive in California?

California gas is generally more expensive than the rest of the nation due to:

1. High local taxes. Taxes can make up about 13% of the price of a gallon of gas, according to the U.S, Energy Information Administration
2. California's regulation for a special more environmentally friendly blend that tends to be more expensive
3. Reliance on local production or foreign imports and nearby refineries, some of which were shuttered for maintenance last month. "There aren't any pipelines around here," Shupe, said.

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Will gas prices keep falling?

Yes, according to experts.

If violence does not spread further in the Middle East and there are no other geopolitical shocks, "I believe the national average still has some 15 to 35 cents of declining to do,” said Patrick De Haan, head of petroleum analysis at GasBuddy.

He said he remains "cautious, that this depends on actions that are not foreseeable, mainly the conflict in the Middle East. For now, the national average is likely to soon fall to its lowest level in six months."

More than 20% of global liquid petroleum in 2018 moved through the Strait of Hormuz, which is located between Oman and Iran, and connects the Persian Gulf with the Gulf of Oman and the Arabian Sea, according to the U.S. Energy Information Administration.

Where is gas the most expensive in the U.S.?

The five states with the most expensive gallon of gas, on average, as of Monday, according to AAA:

1. California: $5.621
2. Washington: $4.902
3. Nevada: $4.787
4. Alaska: $4.559
5. Oregon: $4.538

Where is the cheapest gas in the U.S.?

According to AAA:

1. Georgia: $3.065
2. Mississippi: $3.067
3. Texas: $3.067
4. South Carolina: $3.108
5. Alabama: $3.115

Medora Lee is a money, markets, and personal finance reporter at USA TODAY. You can reach her at [email protected] and subscribe to our free Daily Money newsletter for personal finance tips and business news every Monday through Friday morning.