Hpsov.
Vh-kam advice is correct.
If I may add my two cents worth....
Imho it is better for you to try and deal in "facts", and with todays communications you can.
If you need 767 information may I suggest you could e.mail Boeing and then you will know,and nolonger be confused.
If you could read in the 767 manual...
The definitions of Holding speed.
The definition of engine out speed.
The definition of Enroute hold speed
I think this will help you.
Your question covers quite a lot of ground in various areas of 767 operation and I will email you my thoughts, but leave others such as BA trainers on the 767 and more current than me to answer you here.
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We will do the drill according to the amendments to the amendments I er think?