I wrote a decent article last year about why you don't need to drive around with fog lights on all the time. But that was back in Kansas/Missouri, where I estimated around 10% usage of fog lights for no reason. I estimate upwards of 20% of Jacksonvilleans use fog lights all the time, at least over here in Arlington. In fact, my estimates tend to be 20-30%, based on the scientific method of counting cars when I drive down the street.