Costco Gas Prices in Phoenix, AZ

Phoenix, Arizona has 4 Costco fuel centers serving members in the area. Across Phoenix, regular gas averages $4.614, premium runs about $0.51 higher at $5.129, and diesel sits at $5.559. That's about $0.09 above the Arizona statewide average of $4.527. Within Phoenix, Costco Thomas Road posts the lowest regular at $4.559 and Paradise Valley the highest at $4.699 — a $0.14 spread worth checking before you fuel up. Across Phoenix, regular pump prices have climbed about $0.21 over the past two weeks, from $4.399 two weeks ago. Premium has climbed about $0.25 and diesel has climbed about $0.06 over the same period. Diesel is available at 1 of the 4 Phoenix stations.