Most sector-leading stocks fell Wednesday as the major averages ended mixed. SodaStream's (SODA) rally fizzled in high volume, but FleetCor (FLT) approached a new high. FleetCor, which provides fuel cards to commercial vehicle fleets, rose 78 cents to 52.45, closing a shade below its high of 52.87 hit on Nov. 27. The stock is well beyond a 41.40 cup-base entry. SodaStream, which makes machines that can turn tap water into soft drinks, staged a