I-40 AZ, exit 9 is the cheapest gas on I-40 west of Flagstaff. Plus the Pilot Truck Stop is very entertaining (and with all the rest stops closed between Flagstaff and CA, ya gotta stop somewhere). They stock everything imaginable to plug into your DC outlets. Interesting customers that have crawled out of the desert. Truckers with long beards. And then there's the wall of coffee. You must see it to believe it. Sorry, I have no photo for you. What I do have is the cool coffee cup lid. Excellent design. And the coffee tastes great too (I tried Dark Roast).