12/19 AAA Arizona says the average cost of a gallon of gas in Arizona is at $3.13, down 7-cents from last week. The national average dropped 4-cents since last week to $2.89. Phoenix has the highest price in the state at $3.21 while Tucson has the lowest price at $2.88. The national average per kilowatt hour of electricity at a public EV charging station stayed the same this past week at 38-cents with Arizona remaining at 42-cents.
