xONE3's are possibly the most efficient under the 16 segment regime, even then they still waste an intracontinental segment. (4 asia + 6 na + 4 eur + 3 intercontental = 17 segments)
Try this for 54,693 miles:
Code:
cgk-nrt-jfk-dfw-anc-dfw-sea-ord-amm-mad-lhr-mct-lhr-nrt-del-nrt-cgk
I'm sure some of the others here can get more out of one of an xONE3.