The new tires and reactivating the AWD system could definitely be the cause of the lower MPG. I’ve lost 2 mpg sometimes when just changing tires. The winter gas formula could also be a factor. Also thoroughly inspect the vacuum hoses.
What puzzles me is the whine... If it were my vehicle I’d start with the tranny/AWD fluid levels and the tires. Also, are you 100% sure it has the correct fluids? As my 95 850 reached high miles it developed a slight whine in the tranny but only when decelerating. My 2002 Passat has a strange whine too. It only happens between 40-60 mph. Been there for awhile. Obviously not serious and not too noticeable or objectionable.
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Will I buy another Volvo??? We'll see....
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