Stock Dunlops on mine with the 4X4 suspension....I still get 300+ miles per tankful. I just turned 300 miles on this tank of fuel and the low fuel light hasn't come on yet. And that's with regular (87 octane) fuel and synthetic blend oil. Next week I put in Royal Purple full synthetic oil.
I haven't had mine in the snow, so I can't help you there, sorry.
Man Dave, let me tell you. Today was the FIRST time my rig spit gas all down the side of the truck. In almost 2 years, never but today was the day. I was really trying to pack it in to check the mileage pretty close. Oh well, bring him home, wash the driver's rear quarter to get the junk off ........ Gas today here for 93 oct was $4.24.9/gallon!
I paid 4.27 for 87 octane today. I get about 270 miles before light comes on. That leaves me about 50-55 miles left from what I have read. Light comes on early so who knows. Thats when i fill up. I have a 3" lift and stock Duellers and steelies.
I live in a snow & ice area and have a 4x4 but do 99% of my winter driving in 2wd until I need to climb a steep slippery hill and then I only momentarily engage the 4wd only when absolutely needed. The TRAC system does wonders for the rear axle alone.
I use 4wd much more frequently off-road then in the winter but for different reasons.