For winter tires forget MPG, I think with a faily light weight Taco the narrower tire will give better on-road traction. I'm pretty sure you won't see a MPG difference that you can point to the tires, but higher ground pressure is better IMO. Apperantly tirerack seems to offer a one size narrower when looking for winters. I remember how well an old escort cut thru the snow with 155x13's.
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