Reactivating the AWD system and installing new tires, especially if they have an aggressive tread pattern and aren't properly inflated, could both add up to a noticeable decrease in fuel mileage. Also if the new tires are larger in circumference than the old ones then the car will be covering more ground than previously, but the odometer wont be aware of it.
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Current rides: 2018 Volvo S60 Inscription (What the heck do all these buttons do?), 2005 Volvo S80 2.5T (Soon to go bye-bye), 2003 Volvo V70 2.4NA (The family "truck"), 1973 Volvo 1800ES (STILL not road worthy!)
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