A 9.3% gain propelled the shares of used car retailer Carmax (KMX) to a one-day jump of 120 spots in SIA S&P 500 Index to 90th place, returning it to the Green Favored Zone for the first time since October. Yesterday, the shares staged a major breakout, blasting through the $110.00 top of the channel to a new all-time high on increased volume, signaling the start of a new uptrend.