By Steve Wittich When the final 30-minute tune-up for the Firestone Grand Prix of St. Petersburg began at 10:40 am, the ambient temperature was already 80F, and the track temperature was 96F. When the session began, 22 of the 24 cars went out on the Firestone Racing Primary Tires (Blacks), with Santino Ferrucci, Charlie Kimball,…

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