The national average price of gas was unchanged at $3.10 last week. The national average is down -3.8 cents from a month ago and down -52.6 cents from a year ago. The national average price of diesel has decreased -2.0 cents in the last week and stands at $3.499 per gallon. The median US gas price is $2.96 per gallon, unchanged from last week and about -14 cents lower than the national average.