They don't. The only two diesel selling Costco locations in AZ are: N Phoenix 19001 N 27th Ave, Phoenix, AZ 85027 Prescott 3911 Highway 69, Prescott, AZ 86301
not diesel.
No diesel sadly!
The Costco I usually go to, on Market, does not sell diesel. They only have premium and regular.
Yes, pretty sure
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