I bought used a set of rims and blizzak snow tires for my Boxster that apparently came off a 911. I just use the car in the city in winter with the winter tires only and never get stuck. I put them on in October and take them off in late April. The back end breaks away easily but are very satisfactory. I would never consider driving here in winter without snow tires. If I drive to Arizona or California next November then I would stick with the winter tires there and back. If there is premature wear so be it. And I did not buy the Boxster for good gas mileage either! Better than getting stuck.