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Is it normal for runflats to lose air more than regualr tyres?

I have a 2017 BMW 4 Series with 225/40 R19 tyres on the front and 255/35 R19 tyres on the rear (runflats). Over a two month period, both rear tyres have lost 0.3 bar and the front tyres 0.1 bar. The BMW dealer states this is not unusual with runflat tyres. I would appreciate your view on whether this is normal please.

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It's not the fact that they are runflats. It's the extremely low profile of the tyres that means the rimseals take a greater pounding.
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