The GasBuddy national average gas price increased 2.2 cents to $3.11. This is flat from a month ago but -16.5 cents below a year ago. The median U.S. gas price is $2.99 per gallon, unchanged from last week and about -12 cents lower than the national average. The national average price of diesel has increased 0.8 cents in the last week and stands at $3.632 per gallon.