Costco Gas engine ping/knock

The only thing slow at a COSTCO station is the person at the pump in front of you.

 

I've gotten fuel at Costco a couple of dozen times (especially while on vacation in Hawaii since the savings was significant) and never had an issue. Maybe you just had a stroke of bad luck?

 

I just got gas at costco the other day, same location as OP, No issues with it that i can tell.
I'm sure it's fine.

 

Good to know.

I have been paying a little more for Chevron, I think I'm on my third tank. Not sure if it's the break in the weather
or what but today the truck at 3/4 of a tank was running like a top. Kinda like it shed it's skin ( at 20,750 miles ) and
kicked it up a notch.

Took it onto some dirt today probably violating all manner of Tribal Law and ran 4-Hi and 4-Lo for a bit. I'll PM @Phlogiston on that location....
Dirt roads in Metro Phoenix are far and few between 'eh..?