I have spent 10+ years working in the field of fuel efficiency and CI. I work it from two angles, as a current line pilot that still flies and has flown multiple types from Boeing and Airbus, and from the engineering & fuel efficiency side. The number do not lie. Low CI operations are just different to what we are used to, the world has changed and we have to adapt to it.
Fair enough Canuck, I guess I'll have to keep playing a mugs game in the absence of anything more accurate and representative.
It makes me wonder why Boeing or Airbus for that matter promulgate information and thinking such that we actively use the FMS as a "how goes it" tool to fly as efficiently and effectively as possible given the inherent errors in the system.
Playing devils advocate, are you suggesting that these rather crude and inaccurate tools are in fact a hinderence rather than a help?