Costco’s premium gas, available at locations nationwide, has sparked a debate among drivers about its exact octane rating. Is ...

Shoppers compare Costco, BJ’s and Sam’s Club in Jacksonville to find best membership prices, fuel perks and closest locations ...

What's meant by "premium" isn't the same from gas station to gas station or even from state to state. So what will you find when you pull up to a Costco pump?