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It's a safety issue for me; here in NH, people who don't fit them generally end up in the ditch. The cost of repairing the car afterwards exceeds my fuel bill for the year, so I try not to do that :-)
That said, I do see a drop in the winter, but most of it appears to be due to the change in outside temperature and fuel formulation (that is, I'll see the mileage drop even before I change the tires over, and the mileage will start to be better again in the spring before I change back); there might be a 1 or 2 mpg change that's just due to the tires. I can't check this year because I'm in the process of building a house and will be moving to it late this winter, and I'm still learning the local roads, which has more of an effect on mileage than anything the tires can do short of running on all flats :-)
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