Costco Gas Prices in Phoenix, AZ

Phoenix, Arizona has 4 Costco fuel centers serving members in the area. Across Phoenix, regular gas averages $3.499, premium runs about $0.50 higher at $3.999, and diesel sits at $4.399. That's about $0.02 above the Arizona statewide average of $3.480. Within Phoenix, Costco Cave Creek posts the lowest regular at $3.499 and Thomas Road the highest at $3.499 — a $0.00 spread worth checking before you fuel up. Across Phoenix, regular pump prices have eased about $0.70 over the past month, from $4.199 a month ago. Premium has eased about $0.70 and diesel has eased about $0.56 over the same period. Diesel is available at 1 of the 4 Phoenix stations.