For what it's worth, my figures are below, for this calendar year up until just after next weekend. Since mine is mostly long-haul international, it's comparing apples to melons, I know.
~US$2700 - Total airfares paid
58,711 actual miles flown on UA/SQ/AN/NH
4.60 US cents per mile flown
26 segments flown
2258 average miles per segment
US$104.00 average cost per segment
For what it's worth, the variance per ticket is quite low: 4.36c/mile on Aust-Japan-USA, 4.71c/mile on RTW, 4.16c/mile on one US domestic. The only high one was SFO-SEA return, at 9.44c/mile. Yep, I pay twice as much per mile to fly UA Shuttle!