I use only shell, apart form the odd time I've had to get a few gallons to get to a shell, and I've gone through over 500 full tanks of gas now, no problems, always about the same mileage. I have seen it, friends of mine, who buy "the cheap gas", and they told me how much that save buying gas there...I told them to fill up at a good gas station and see what they get for mileage...they got about 150 kms more on a tank, they haven't been back for the cheap gas.
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