Wondering if this is a common issue with other Sparks. On days when the windshield is frosty I have noticed that it is also fogged over on the inside. If it is really cold it is almost frosty on the inside too. And since it takes a while for the car to heat up enough to get rid of it while sitting at idle this is a real pain. I hate to have to go out and start the car and wait ten minutes or so before it is safe to drive.