One thing I love with the XR is the pressure is the same for riding alone and with passenger/luggage - I don't know if BMW lies to make it easier for it's customers but all other bikes have different pressures.
Problem is that most gas stations don't have an accurate gauge and I have to carry one with me. With the TPS - problem solved! It is preset to 280 kpa (~2.8Atm) rear and 250 (~2,5Atm) front and you can't change it.
Last spring when i "woke" the bike from winter sleep the front was at 200 but there was no warning - I guess the warning goes on at at least 1 Atm (~101kpa) missing.