Movement costs are always automatically calculated, and the lowest cost route is always used between two territories.
These costs can be views in the Movement Costs view at any time, which emulates the Move and Attack phase, but does not allow you to submit orders.
This table shows the movement costs associated with each tech level to move one unit across one border. All movement costs are rounded up to whole units. When transporting armies there is a minimum 1 oil cost.
|Tech level||Oil to drive a Tank||Grain to march an army||Oil to fly an army||Oil to fly a tank||Oil to move a navy|