That's what was reported. I think you could (from previous proper test, empty to empty vs reported consumption in previous IS300h) take 3mpg off this. It's still amazing. Car is ES300h 2019 model.
I heard an Irish chap living in England and working for Honda, talk about how to save fuel and he said to reduce speed on the motorway, and generally, and that modest enough reductions can have a big effect, as well as usual coasting, easy on pedals etc. I normally do the latter but tend to drive at speed limit on motorways.
I had to drive this distance in the last three days. About a third was motorway. Here in Ireland Limit is 120kph (75mph) so I drove this at 65mph, and on good secondary roads, the limit is 100kph (62) so I tended to keep that at about 55 ish. Some of the roads were poorish country roads, a bit up and down and drove them at appropriate speeds. The temp was up to 12c. Car contained myself and my wife and some suitcases. I'm over 13st and she's about a slim woman of about 5'5".
I never accelerate hard unless it's appropriate.
My usual consumption is usually over 50mpg in town or country.