Ken,
To do this you must drive many laps around each individual circuit, including their multiple route tracks. You will also have to do some drag racing at the airfield/laguna seca too.
Its best to use the Free Play mode to increase Drivatar level.
I’m not sure how many laps you have to do on each circuit, I suppose 10-15 would do the trick.
I’m at 87%. I still have to the variants of some of the tracks and a few of the drag strips. You can view what tracks you are short on when you look up your stats in “my profile”, I think.
Maximum possible as of today is 95% - there are a number of airfield tracks that do not have races on them so cannot get off 0% and hence mean the maximum at the moment is 95%.
You need 10 laps at every circuit tracks plus the 6 drag track variants.
Go to your profile within FM5 and across to drivatar and check each track. For all tracks except the tag tracks if you have less than 100% you need to run 1 lap for each 10% you need.
No benefit - just tells you how accurate the drivatar version of yourself is, so good for those who race against your drivatar but pointless from your own point of view.