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On my parents' 2004 wrangler rubicon (replaced by 2008 rubicon), we used two different snow tire sets for the vehicle over the 4 years we had it.
The first was 205/75-15 tires. The gas mileage went down (but it was WAY low geared with them) ... but it beat anything to 60mph.
The second set of tires was LT215/85/16 Goodyear Workhorse tires. Much skinnier than the 265 tires that were on it for summer. The winter we used those tires, gas mileage didn't change much at all. Now, it did actually get better mileage, because when those tires were on it was winter and mom would idle it in the driveway for 20 minutes (poor piston rings) before leaving for work and then idle it in the parking lot at work to keep warm. It is a 40 mile round trip.
If I ever owned a truck vehicle, these are the tires i'd get. They have little rolling resistance for the tread.
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