The national average price for regular gas decreased again on Friday, dropping to $3.973 per gallon. It marked the fourth straight week that the national average price for a gallon of regular gas dropped in the U.

With prices at the pump falling for three weeks, 24 states now average below $4 a gallon. See where drivers are getting a break—and where prices are still high.

Latest stories about Gas Prices on Business Insider

Gas prices are falling after the Iran deal, but low inventories, tanker delays, and reserve restocking may keep prices above pre-war levels for months.

KEY TAKEAWAYS Sliding oil prices have helped gas prices fall for four straight weeks, bringing the national average below $4 for the first time since March.The national average is $3.999 today, down 13 cents from a week ago and well below its mid-May peak of $4.

WASHINGTON >> Gas prices have remained high due to the U.S.-Israeli war with Iran. But are they high enough to alter the business of the American auto industry?

MarketWatch asked seven EV owners around the U.S. how much they're saving on gas. As average gas prices across the country hit $4.54 a gallon Wednesday - up 24 cents just from last week - many drivers of electric vehicles say they haven't noticed.