Did a 610 mile roundtrip to E.WA with family this weekend - a kickoff to camping season. 2 adults, 3 kids, 3 stuffed luggage bags, cots, etc.
About 400 miles of the trip were on interstate at 80mph. Up to Snoqualmie pass, then down to the desert of E. WA.
The rest was hilly and twisty county roads and state routes at 55-65mph. Ocasionally at 80mph and DS mode. Enjoyed them - a lot
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MPG-wise, did slightly better than I expected, accounting for driving style, weight, and terrain. 25.2 mpg.
Even had a chance to climb up a forest road. The hill descend control worked marvelously when coming back down.