That's what I use (ethanol free only) ...you haven't changed your tires lately;or checked your pressure?.. I keep mine around 38 or 40 year round; and when the weather broke hot, my traction light was flashing in the curves on me & reducing power.... Also if you're running K&N air filters (or something with oil) make sure they're not over oiled/ you could have your mass air flow sensors oiled up...
Just a couple things to check.
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