This thread is highly useful, and I appreciate everyone's creative ideas in terms of what to do about flats. I'm probably going to go with a full-size OEM tire and wheel, and use it primarily on long trips. It's big, it's heavy and it's expensive, but my recent experience with a slow flat on local driving demonstrated to me in no uncertain terms how brutish a flat tire can be on a car without a spare.
There are a whole series of Catch-22s and no-win scenarios when we get a flat on a C-Max.
-The repair kit may or may not hold pressure, and you only get one shot. (I'm getting two canisters when I pick up my replacement!)
-You can call Ford Roadside Assistance, but it's only going to be for a tow. The literature clearly states that they only replace the tire if the customer has a working spare. (Since I can put on a spare myself in like 10 minutes or less, I wouldn't be inclined to call anyway. But no spare!)
-Even if you successfully use the latex in your tire, now you have NO OPTIONS but a tow if you happen to get another flat, or if the primary repair still goes down slowly.
-According to the literature, the tire pressure monitoring system on the affected wheel needs to be serviced/replaced by Ford after a flat is repaired.
-Finally, my long-term mechanic (who I had fix the flat) said I still have to bring the car back to have all that latex cleaned out of my tire--here's the kicker--because it corrodes the wheel itself, given enough time.
So a proper spare it is for me.
Edited by P=E/t, 09 May 2015 - 10:10 AM.