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[TheBoy]

normal tires when used with low pressures for sometime start to fracture and erode in the sidewalls which is "good for your health" in the near future

not sure the same applies to run flats , but imo they are "human made" so cant resist eternally

Letting the air out of runflats will just put the alarm on, possibly speed limit car, and knacker the tyre.

The pressure sensors only go off if one wheel has less rolling resistance than the others, so if they're all the same they should be fine 

It won't be good for the tyre though to purposely let the air out of a run flat though.

I know the older ones actually recorded the pressure in the tyres (and CAN'd that to SRS ECU, so if you had a smash, and tyres were incorrect......)

[Del Boy]

They did do that before, but apparently it was too much effort changing tyres according to a tyre fitter I know. Which is why they came up with the rolling resistance idea which is a stupid idea in my opinion anyway.