Costco Gas Prices in Phoenix, AZ

Phoenix, Arizona has 5 Costco fuel centers serving members in the area. Across Phoenix, regular gas averages $4.305, premium runs about $0.628 higher at $4.933, and diesel sits at $6.099. That's about $0.083 above the Arizona statewide average of $4.221. Within Phoenix, Costco Thomas Road posts the lowest regular at $4.249 and N Phoenix the highest at $4.359 — a $0.110 spread worth checking before you fuel up. Across Phoenix, regular pump prices have eased about $0.244 over the past month, from $4.549 a month ago. Premium has eased about $0.216 and diesel has eased about $0.100 over the same period. Diesel is available at 1 of the 5 Phoenix stations.