I always buy gas from the same place when we are near home. Any other time like on vacation or road trip I always try to buy from large name brand gas stations that have a separate pump for each octane rather than a shared pump for all octanes. A friend of mine who is a tech for Exxon told me that when you buy gas at pumps that share all octane levels you will get the same octane for about a gallon of the person who used the pump before you. Now, for most people on a stock motor that's not a big deal. But for someone on a boosted setup or built motor setup with a edgy tune and only pumping a few gallons to save weight, it could be an issue.
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