I don't think the sulfur content is really a function of the brand of gas. As far as I know, it's not a "regulated" substance, so refineries don't have to go to the expense of removing it. It's present in crude oil, except "light, sweet" crude, which comes from Saudi Arabia, is supposed to be very low in sulfur.
I suspect any brand you buy could be high in sulfur at any given time.
- Jack
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