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The 1995 Subaru Legacy wagon was available with 2WD or AWD, and the EPA rates them at 21/29 and 19/26, respectively. AWD adds extra driveline friction and over 100lbs of mass, some of it rotational.
Good thing you did A-B-A, or we would have drawn unjustified conclusions. For example, if you had tested first with dimples and then without, we might have figured dimples were good for +5% MPG.
I take it you did one run heading north, then one run heading south? I see clear evidence of wind during your FWD testing, and a hint of wind in the AWD testing.
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