Kwagga, welcome to the forum, I'm in SA too. Not too sure about runflat mileage, but I'm not very surprised at your description of the front tyres - remember you have permanent 4-wheel drive, so the front wheels have to drive and steer at the same time.
I have a sDrive18i, rear-wheel drive of-course, and I've only done under 4k. But 25k does seem a bit quick to replace your tyres. I'd say visit a Tiger Wheel outlet for advice (they should have runflat expertise) - and then compare what they say to your BMW dealer.
I have the same Pirellis - I think these are X1 standard globally.
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