We've had several cars with run flats as factory. Found them to ride terrible, wear really fast, and very expensive. Do not be fooled into thinking you cant be stranded with runflats...wife had a MiniCooper S with them and got a low tire warning a few blocks from her office, when she turned into the parking garage (low speed obviously) the tire unseated from the rim, so she effectively had a "blowout" and couldn't proceed.
A lot of newer cars don't have spares, only an inflator kit...basically a can of slime and a 12v compressor. My CTS-V wagon is like this and we had a Volt that was same. We did get stranded in the Volt once when the sidewall got split on the interstate...no slime is fixing that.
Jeff-
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You remind me of the timing on a turbo engine...
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