Was going to say the same as @ovekvam regards run flats -as I had the same issue because I thought the pressures didn't need checking because the car would warn me. So I have gotten back into the habit of checking once a month... and recently switched to non-run flat tyres too (for which I understand the system will work as expected).
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Current: 2014 F21 M135i Estoril Blue
Previously: 2012 F21 116D M Sport Estoril Blue
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