[Tenac]

The biggest thing when worrying about gas from stations is the volume of fuel going through it. Less people more time for fuel to sit in tanks and condensation caused water down fuel. Second part is the additives that are used for fuel stations but you will have to research that. I've always like Shell just opinion based on no issues while using it. They also supply Kroger their fuel so I don't mind filling up at my grocery store with the discounts. A place like costco you have nothing to worry about due to the volume they sell.