Penske Chevy driver Will Power maintained his mastery of the 2.385-mile Sonoma, California road course Saturday morning by dominating the final practice session for the GoPro Grand Prix of Sonoma. But today the gap back to the second fastest car was over 4/10ths of a second ahead Target Chip Ganassi Honda driver Scott Dixon.
Power's Penske teammate Ryan Briscoe was third ahead of Dixon's teammate Dario Franchitti with Sebastien Bourdais rounding out the top-5 for Dragon Racing.
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