Shell is my main gas. QT was my back-up gas till recently. I noticed when I put QT in the car it felt sluggish. Up until a few months ago this was not so. But if you want to still use QT? Do it... Remember, QT is the only guaranteed gas in the state. So if you ever have any problems with your motor due to bad gas? You can make a claim and they will repair or replace your engine. At least you have that much.
I personally would stay away till they make it back on the top tier list.
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