For what it's worth, I've run Shell V-Power for the last 225,000 miles, no problems car still pulls good, and get the same mileage I always have. In the US when I've been out there with the car I do find I get better mileage with the gas in general. Also I run the highest octane available when I fill up in the US, I try to only fill up at Shell there also, but if I can't find one I try and stick with "good" brands.
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