Okay, I see. The figures I have here are the POH figures at MTOW. But I'm still a bit puzzled. As far as I know, the load figures vs. fuel consumption should always be equal, since load% is defined as a fuel consumption issue, or not? Here's what it should be, according to the POH:
100% - 7.4 USG
90% - 6.6
80% - 5.7
70% - 4.8 (but at 70% ours indicates 5.2 USG/hr...???)
60% - 4.0
50% - 3.3
Ours is airways equipped, 815.3 kg empty. And I don't think it's been polished recently - or ever...
Our club is large (700+ members), owns 20 planes or so and owns its own maintenance outfit which is licensed for Diamond/Thielert. I don't think they'll appreciate me flying to Scotland for a bit of tweaking...