You picked up 3.5mph over the course of the night. Temps will have a huge effect on a supercharged car . . . Not sure how the ESS tune works, but on my previous car (2008 corvette) the ECU would start pulling timing once the IAT reached 88 degrees. There was a noticeable drop in power in hot weather, my estimate would be 25-30hp. Run it when it's closer to 60 degrees and you'll see a couple more mph.
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