Yeah, any car I've owned, I've started to notice subtle differences depending on what type of gas I use, how close I am to an oil change, the air temperature outside, whether the a/c is running, etc.
And yup -- Chevron or Amoco 93 octane is the only way to go! Although it's a little less than $2.94/gal here -- I paid $2.27 at my last fill.
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