Walmart Fuel Station

Costco is usually cheaper, but not always. If you use a bunch of Gas, paying the annual Costco Fee, and getting 4% of all gas purchases back on the affiliated Citi Bank Credit Card, is the cheapest way to buy 87 Octane Unleaded Gas in all of Arizona, especially at the Tucson Marketplace location, accessible off of the Ajo Way Exit (#263) of I-10.
I hunt for Gas Prices daily, and you might do better using Cash by a few pennies, but if you can generally wait 3-12 minutes to gas up, Costco is the ONLY Tucson Arizona Answer.
Note: If you regularly drive by one of the 3 Costco locations in Tucson, then you are the OBVIOUS Candidate to switch THIS WEEK!
Note #2: Although there is a $60 or $120 annual fee assuming you can't just be added to a family members account, you do get kickbacks from Costco annually, so some OR ALL of that annual fee comes back to you.
I already have $400 coming back to me on the 4% Credit Card side, and that'll be $600 by the time it kicks in February.

Great gas prices. Sometimes there is a line but worth the wait

Friendly & helpful staff on hand. Gas prices not to bad. Closes at 10 pm.

If they keep these prices at the same level as Costco with 10c savings for members, they have my business!

Very happy to have found this..

Beware when it’s busy, it’s lord of the flies when it comes to traffic control