Anyone driven an SL55 AMG? Im looking at a 2005 SL55 vs 2004 C4s. I know the C4s is a great car and can easily be driven in the winter. The SL is more luxury and has crazy torque/hp but I wonder if its possible to drive like a grandma in the snow with snow tires and put 18in rims on and take the 19in rims off.. Or.. am I crazy? The mpg on the SL seems to be around 15mpg and the C4S around 20mpg?