The GasBuddy national average gas price increased 4.8 cents last week to $3.09 despite oil prices falling. This is 2.2 cents above a year ago but -9.6 cents below a year ago. The median U.S. gas price is $2.99 per gallon, up 5 cents from last week and about -10 cents lower than the national average. The national average price of diesel has decreased -0.2 cents in the last week and stands at $3.624.