I asked Peter Rawlinson why the 19" wheels have a higher pressure than the 20" or 21" wheels since for most cars it is the other way around with lower profile tires having higher pressure than higher profile tires. Peter told me that the 19" wheels ride better at 45 PSI but they could not achieve the 500 mile range without increasing the pressure to 49 PSI. If pressure above 49 PSI further increased range, Lucid probably would have specified that. Hence, I don't see a reason to increase the 19" over 49 PSI because you are likely degrading the ride without improving range.