We will deploy early next week a new version of GraphHopper with improved ETA values and route choices especially for rural areas. This affects all APIs using OpenStreetMap data.
This is a follow up of: Improved Feature: Better ETA values
Even after weeks of tweaking and testing we could have made mistakes. Please let us know if this decreases quality in your area.
Update: this was rolled out on Monday, 21th Jan at around 9am-1pm CET