I have a 2016 Radrover and I kept my original tires in the 17-22 PSI range (always put 1-2 extra psi in rear tires). Lower PSI provide better traction for dirt/sandy/rocky trail riding at lower speeds. The higher PSI was more efficient, less power to maintain 17-20 mph speeds, and used less battery power when I did mostly paved road riding.
I just added the Fanttik X8 Ace Bike Pump 150PSI Fast Portable Tire Inflator, $50, Amazon, to toss in my topeak rack bag for easy psi adjustment on the road or trail.
I just added the Fanttik X8 Ace Bike Pump 150PSI Fast Portable Tire Inflator, $50, Amazon, to toss in my topeak rack bag for easy psi adjustment on the road or trail.