For those not already owning a very portable and affordable air compressor you can run off your battery terminal or a cigarette type lighter plug in from the BMW powerlet plug, the SLIME air compressor is at a good price from Gander Mountain and shipping is free. Try coupon code GME0423 for an additional 10% discount.
http://www.gandermountain.com/modperl/product/details.cgi?i=401541&pdesc=Slime_Power_Sport_Tire_Inflator#details_box_holder
Auto Zone usually runs in the springtime, the same pump at $29.99 with a $20.00 rebate. So stock up and get one for a friend in need.
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