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Re:A glut has used-car depreciation accelerating by kspaans on Wednesday August 23, 2017 @02:42AM (#15079075)
Given that you have to pay an annual membership fee to get access to that gas, it's likely subsidized by the fee and used as a loss-leader to bring people to shop at Costco.
Re:A glut has used-car depreciation accelerating by Baeocystin on Wednesday August 23, 2017 @03:36AM (#15079379)
Costco does not subsidize its gas sales. It makes money from them:

https://www.fastcompany.com/60019/tiger-costcos-tank

It's an older link, but they still do much the same. There have been court cases brought against them by consortiums of other gas stations here and there, but AFAIK Costco has emerged victorious so far.