I was doing a Forzathon this morning (as usual) with a Dirt Track for the Drift Event. I was staying on the gravel, but obviously not the gravel of the middle of the track. Tarmac drifting is easy as you can see the limits of the track but with Dirt, the limits of the track seem to be much more difficult to judge.
Dirt drifting is not terribly bad. It is easier to stay in the middle than the outsides. If you want to drift the outsides, you will need to figure out exactly where the edge is so just learn a particular line and slowly move it further and further out until you are not gaining points in a full drift. Usually it’s either going to slow or not the right angle on the dirt that causes a loss of points.