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Can you still get as much info from a book by previewing / postviewing / rapid/superreading etc without pring at all?
Probably yes, however my experience is that it takes much longer. Thats why I prefer to spend the 3 to 10 minutes photoreading the book first. It saves a lot of hunting and if the information isn't in the book I know it inwardly straight away. (that comes with experience)
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And what happens if you just pr without anything else? can you still remember stuff from the book? I
If you just PR the book without activation, yes, you know the information internally however you lack the conscious connection 'that you know and how you know'. You sometimes find the information coming up and there have been photoreaders who have answered exam questions successfully having only photoread the text book without activation. That this works depends on your willingness to trust your inner mind. That is why it is recommeded that you do the activation step, to build that trust/faith in the system.
I have PRed books without activation and used the knowledge I gained from them. Eg I photoread a business planning book, did not activate it, yet was able to provide information on a number of aspect of business planning to help someone write an essay. Whereas prior to photoreading the book I was at a lost as to how I, would even approach the essay. I was quizzed about the topic and from the information I provided an essay was written. The resulting essay earned 70%, losing marks for incorrect layout.
To this day I haven't activated the book since I am not personally interested in the topic. It came up as a subject recently with a friend. I think he is impressed with how much of the finer detail we were able to discuss about someones proposed business.
So yes the information is placed into the inner mind at that rapid pace.
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I dont doubt for a second that your subconscious can proccess 25k wpm, but Im a bit skepical about whether its possible to recognise words at that speed.
While the eyes provide the lens it is the mind that sees. Put another way, without our brain to interpret what we see, everything we see would just be pretty colours anyway. It's our thinking/mental interpretation that helps to make it make sense. 
Alex
