That's excellent, especially up 5,000 feet in an SUV! I have an xc70 (the wagon and not the SUV), but it has the same engine and EPA rating. Best ever for me was 31.8 on a 500 mile interstate trip at 65 and no AC. But it is smaller and lower to the ground than the xc90, and mine has a 4-speed with a longer top gear.
Interesting idea to lock the transmission into 5th gear - I never thought to do that. However, if you push the "winter" button the car never shifts below 3rd - something to remember for your next "bet". I haven't decided if that saves fuel or not, but it sure does annoy the people behind you at lights!
FYI, the AWD is not really full-time - 99% of the time it is FWD. Only when the front wheels slip is power diverted to the rear. And you are right - they are very nice cars.
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