Can I get gas at the chevron with my Walmart gift cards?

I would call first

no.

If you have a Colt 45 you could do it.

If it is a visa Walmart Giftcard yes, otherwise no

If it is a Walmart Gift Card you can not now if you got a Gas Card from Walmart then you can use it

Is a gas gift card? Or just Walmart? They are different. You probably won't be able to.