save gane posted.
I did a test too and I have a different result:
* Pressing F1 to activate the cheat and checking max Praxis did nothing (same max Praxis as if I didn't use the trainer [5000 IIRC]).
* Activated Unlimited Energy and checked max Praxis again and this time I have a super big number!
My mistake - just pressing f1 doesn't cause the high number, you have to do something in game to change the state also (such as earn praxis or trigger a cutscene)