I'm requesting a significant reduction (50% less) in the fatigue drain while moving dismounted (at any speed) on roads.

The 'realistic' reasons behind this is walking/jogging/running on paved or dirt roads is much easier. Traveling on foot on the higher grass, shifting sand or uneven rock surfaces is more difficult, thus requiring the current stamina drain.

In addition this would add depth to the planning process when choosing whether to travel on the more vulnerable roads to save stamina or travel off-road in a less vulnerable route at a higher stamina cost.