evidence: Today’s average price of gas in the U.S. is $3.18 per gallon, down $0.01 from yesterday, $0.04 from last week and $0.14 from last month. [...] California has the highest price of gas, with an average of $4.67 per gallon of regular gas. [...] Mississippi has the lowest price of gas, with an average of $2.68 per gallon of regular gas.