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Mine Ive had 2 weeks about 1000 miles on her. Alot of driving. Havent timed my 60 but it seems quick. Im happy with performance so far. But Ill try my 60 next time someones with me so they can do it off there watch. But im guessing mine is close to were it should be! To everyone who is not happy I hope GM will fix this problem! Because this is actually false advertisement of there product if not! Good luck guys and gals!
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