Carefully driven, I can do 6 l/100 km with my XC70 D5 (230 hp/470 Nm) AWD automatic from 2012. That's about 47 mpg.
The other XC70 will do slightly better, but not much. It's an XC70 D4 (181 hp/400 Nm) AWD automatic from 2016. It has a slightly higher gear ratio.
These values are from the trip computer. It's slightly optimistic. I've checked when refueling.
Average right now is at 7.6 l/100 km for the D5 and 6.7 l/100 km for the D4. The D5 is still coming down from close to 12 l/100 km after a 2000 km trip with 1700 kg caravan behind it this summer. There's a substantial amount of other trailer towing done with the D5 as well.
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