yup, but the factor is more like 5 and a half'ish
grassland cost 5, but dessert cost 7 (or 8 cant remember), hills add 2 and forest is 7 and jungle 8 (or 9)
Path is 4, Dirt Road is 3, Paved Road is 2 and Highway is 1, while railroad is still 10 moves for anyone.
The reason for doing so in the first place, was I wanted to get rid of the "hidden" movement (0.x) which doesnt show in vanilla (iirc BUG shows it though) and get "pure" numbers only.
Later I added different modifiers and promotions, so movement became a "feature" rather than just a "1 for inf, 2 for horse"