Powertrain efficiency comparison

[LandSurfer]

Does anyone know of a good source of study contrasting the basic differences in efficiency between the following transmissions when used for system drive (not ground drive):

- Mechanical powershift
- Belt drive
- CVT
- Hydrostatic

I have always understood a general rule of thumb when discussing the differences in efficiency (as follows):

- 99-100% efficient for powershift
- 95-97% for belt drive
- 85% for CVT
- 65% for hydrostatic transmission)

Thanks for your assistance.