right click and open this in a new tab for a sensible look at the chart..

more information here. it should be noted that this old review whilst interesting (to some) is based on an old design of hub, the newer Enviolo hubs are certainly free-er pedaling on a manual bike. (although these days mostly fitted to ebikes where Enviolo are the hub of choice (for the money, Rohloff is 4 times the price)

https://www.cyclingabout.com/speed-difference-testing-gearbox-systems/