Still in the queue for a M3, I am concerned at the prospect of driving in eastern Oregon without a spare tire. Are flat tires such a rare occurrence that nobody needs to worry? If I am within cell-phone range, is Tesla's roadside service reasonable, and do they carry spares? If my phone dies, does the M3's user interface have a way to call for service? What would be the consequences of driving 50 miles (very slowly) on a flat tire (assuming sufficient reserve in the battery)? Or do people just buy a spare wheel and jack to carry with them at all times?