I was going to say that the frame weight would depend on the altitude and location on the planet at which the measurements were made, and that would be right... except that it's the mass which Onza have included on the frame .
Edit: I think we need to start including tolerances on these frame decals Joe. 1090±1, +70±0.5, 380±0.5, 72±0.2 WEIGHT 1.46±0.056 would be far more acceptable
Edit 2: Actually, on a serious note, what sort of tolerances are frames in general built to, geometry wise? Obviously mass can vary slightly depending on lots of factors but lengths and angles wise what sort of range do you expect?