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I bought my 2013 2LS in feb this year and was using just reg (no ethanol) - noticed the car seemed sluggish and was making a gurgling/griding/dieseling noise when I would accelerate, so I decided to start running premium no-ethanol and I can def tell a pretty noticable difference. The gurgling is gone, it seems a tad more responsive, engine seems to idle more quietly and I'm not having to fill up as often.
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