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Good question! I've had three cars without power steering that got around 30, 40 and 50mpg respectively (1972 VW Super Beetle, 1993 Mazda 323 and 1985 Golf non-turbo diesel).
I would think the continuous AWD on a Subaru would hurt it's fuel mileage worse than it's power steering. My suggestion as someone who lives in steep mountainous snowmaggedon territory is to avoid AWD unless you absolutely need it, like if you have a long drive way you have to maintain yourself. Other than a few incidents like that I've never seen AWD as a necessity but rather as a convenience or luxury.
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