The only time I experience enough "sluggishness" that other factors could be thrown out the like weather, is when I am forced to use cheap gas like Sunoco, any grocery store brand, valero, etc. When I go to use MOBIL or SHELL on my next fillup the difference is night and day, quicker throttle response car feels more "excited". I don't know, just something that I have definitely noticed without a doubt.
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