Commissions do not affect our editors' opinions or evaluations. Today’s average price of gas in the U.S. is $3.09 per gallon, up $0.02 from yesterday, $0.02 from last week and $0.07 from last month.

Countries with the cheapest gas prices tend to be in oil-producing regions. Countries with the most expensive gas prices are usually small nations or have many taxes and regulations. The U.S. has ...