The GasBuddy national average gasoline price increased 10.6 cents to $3.21 last week. This is up 13.2 cents over the last month and -35.6 cents lower than a year ago. The national average price of diesel has increased 3.6 cents in the last week and stands at $3.594 per gallon. The median US gas price is $3.09 per gallon, up 10 cents from last week and about -12 cents lower than the national average.