Thanks for the advice Roger; I mainly ride on tarmac but also some off road paths.
Lots of good advice already, remember that 45 PSI is the maximum pressure that particular make of tyre can handle. The pressure you actually need should reflect your comfort and wishes, plus your weight. Also, is your bike sprung front and back, or only front? That plays a big "comfort" role....
The advice already given here would appear to be well thought out, though I myself, once I discover the pressure I like (hard), just stay with it as I am far too lazy to keep adjusting them, as I never know where I will be on any particular day....Forest, hills, flatland or road!
But generlly speaking, I like tyres to be hard as I believe (maybe wrongly) that I am less likely to get a puncture....
But I have in fact not had a puncture on either of my e-bikes for some years now, but it could be down to good luck!!
There was a time when I was having them regularly and mostly the rear, where the motor is (on both of them!). I got to be quite good at repairing the tube, without removing the wheel...
Also, my first e-bike had no sprung rear suspension (where I got all my punctures), the new (2.5 years old) one is sprung front and back (I love it!).
regards
Andy