Definitely drive the car year round..if its your only car...(and if your lucky enough to have an extra car...so much the better)
If there is a lot snow and you have one car.....buy some snow tires and an inexpensive set of rims....(it'll just extend the mileage of your high performance summer setup so the cost is a non event)
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2008 Blk Corvette Z51 w/NPP and 2008 Silver AWD 304hp FE2 CTS