X4 on perfectly normal although on a longer drive you should find the inner duals will increase more than the outer tires. A 10-15% increase is normal and it does not take very many miles for it to happen. You should be concerned when you have something out of the ordinary happen which with some more miles you will understand.
On a cool rainy day I had my two tag tires increase 15+% and the other 6 only 10%...definitely not consistent with the norm. Stopped and discovered the pressure regulator was putting 100 psi into the tag’s airbags overloading the tires on the tag axle. Was able to get it back to the 45 psi it should have been putting out... never happen again. Without TPMS I would have ruined two tires, especially if it had been a hot day.
