Feeling a bit embarrassed because I haven't been checking my runflats tyre pressures. My excuse and reasoning is that I believed that the tyre pressure monitoring system would alert me to any problem.
The fronts have worn on the outer edge (just as the last set had done, and others seem to experience as well) and after about 18k I had them replaced. The guy at the tyre place (Camskill in Whitehaven) told me that both front tyres were down to 14psi !!!!! Thinking logically now, i believe that the TPM system monitors the rotational speed of the wheel via the ABS system. A flat tyre will have a smaller rolling diameter and therefore rotate faster than the one on the other axle. However, if both are going down at the same rate there will not be a difference to measure and hence no alert.
Since admitting this to some work colleagues it seems that i am not the only one. I will definitely be checking them regularly now.
You might say that I should have noticed something with the ride being poor but in all honesty it wasn't. They are runflats after all but I would have thought the miles that i must have done on them at such a low pressure would have ruined them all together. The ride with the new set is obviously much tighter but not appreciably so. I am tempted to deflate them to around 14psi and see how they feel, just to confirm that Camskill's gauge is reading right!
Anybody else had a similar experience?