Thinking about getting snow tire for the MainLine/Philly winter. I had a thought that, depending on the season, I could keep either a 19" snow tire (probably a Pirelli Sottozero3) or 19" Michelin Primacy in the frunk as a temporary spare. I would only drive on this spare tire until I could get the damaged tire fixed or replaced. Any thought about this solution? I know driving mismatched tires is a no no, but this would be on a temporary basis, so I was wonder if this might work. Getting another use out of snow tires might make the cost of same hurt a little less.