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My personal hunch is questioning whether there really is a difference to where you get the gas. The price between the different gas stations is fixed between the so-called competitors (Thanks to the lack of anti-competitive/combine/cartel law), so price-wise, I don't see much difference. I go to Petrol China only because I get a discount card from there.
Quality-wise, it's really hard to say. The only way to confirm is to conduct an experiment. Say I fill your car with gas from X brand, and then fill it with Y brand (but with the same octane-rating). I won't tell you which gas station or brand it is and see if you can tell there is any difference performance-wise. I suspect for most drivers, they would'nt be able to tell the difference. But for you guys, can you tell the difference?
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