Costco Gas Prices in Phoenix, AZ

Phoenix, Arizona has 4 Costco fuel centers serving members in the area. Across Phoenix, regular gas averages $4.134, premium runs about $0.675 higher at $4.809, and diesel sits at $5.399. That's about $0.034 above the Arizona statewide average of $4.100. Within Phoenix, Costco Cave Creek posts the lowest regular at $4.059 and Thomas Road the highest at $4.259 — a $0.200 spread worth checking before you fuel up. Across Phoenix, regular pump prices have eased about $0.155 over the past month, from $4.289 a month ago. Premium has eased about $0.115 over the same period. Diesel is available at 1 of the 4 Phoenix stations.