Gas prices slightly decreased after last week’s string of increases. The national average for a gallon of regular gas is $3.447, according to AAA. This marks a slight decrease from Saturday’s $3.452 per gallon price. Gas is also cheaper than a week ago, when a gallon of regular-grade gasoline cost $3.449. A month ago, a gallon of regular gas was $3.60. 

Mississippi is still the state with the cheapest gas in the nation, with a gallon of regular-grade gasoline costing $2.929. Arkansas is right behind, with a price of $2.939 per gallon. California remains the state with the most expensive gas prices, at $4.84 for a gallon of regular-grade gasoline.