New to FlyerTalk, so please don't bash me for this
SEA-CLT-MIA-EWR-SEA for $200 (on united.com) gives about 6400 EQM at 3.125 cpm
SEA-DEN-MIA-EWR-SEA for $200 (on continental.com) for $6200 EQM at 3.25cpm
Same day turnaround possible on March 1-2, March 8-9
Maybe some of the gurus can squeeze out a few more miles out of this one.