One plus you get when you buy a set of tires from Costco is free tire rotation during the life of the tires. This can save you some bucks on top of the good tire prices Costco offers. Recently, I visited the Arundel Mills (located in Hanover), Maryland Costco where I took them up on this offer again. The tire department was prompt, fast and courteous and the best part was there wasn't any charge for the service.
Another mixed blessing Costco offers tire wise is filling their tires up with nitrogen gas vice regular air. The reason they do this is so the tires maintain regular pressure at all times. Regular air expands when it gets heated and contracts (apparently) when it gets cold. This means your tire pressure can change based on the local temperatures. How inflated your tires are can have an effect on your gas mileage Nitrogen doesn't expand or contract based on the temperature. This enables the tires to have a steady pressure and help get you more miles to the gallon. The down side is that nitrogen isn't available every where and, some of it does eventually escape the tires making it necessary for the car owner to get their tire pressure checked at Costco and if needed, get more nitrogen put in the tires. That's why I call it a mixed blessing because, it is a bit of a hassle to go to Costco to get your tires topped up with the nitrogen.
Happy driving all!
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