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Sunoco 94.
Generally high octane blends have more detergent additives, which is good. I don't want to clean my EGR system and throttlebody any more than I have to.
Up here in Canada, we have the dirtiest gas short of Mexico, so it does make a big difference. We still have high sulphur levels in our gas, unlike the US.
In Canada, the cleanest gas is Sunoco, followed by PetroCan.
The dirtiest is Esso, followed by Shell.
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