The GasBuddy national average gas price increased 2.7 cents to $3.11 over the last week. The national average is up 2.2 cents from a month ago and is down -39.7 cents per gallon from a year ago. The national average price of diesel has increased 0.9 cents in the last week and stands at $3.558 per gallon. The median U.S. gas price is $2.99 per gallon, up 3 cents from last week and about -12 cents lower than the national average.