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Around here, I am pretty sure Shell has ethanol in all of their fuels (at least the pump says so), and they are the grossest, most run down, least used fuel stations in poor neighborhoods. Other companies around me have top-tier ethanol free premium gas, and that is what I use. I stick with the busiest stations in the nicest parts of town which will more likely have fresher gas.
I avoid ethanol blends -- it has a high octane but is also corrosive. I drove a Toyota for 16 years on nothing but E10 gas (not even toptier gas for 10 years, as I lived in places where it was hard to find). Despite being on top of maintenance (and being a toyota engine), it has developed corrosion issues to contend with. Paying a little extra in gas is worth it, imo.
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