There are nine of us across two vans. So we end up with two drivers a day.
Those two will cycle back to meet up for lunch (hopefully) or somewhere along the route.
The drivers should end up doing 50-60 miles with the main group doing about 100 miles a day. Everyone should get to total 600 ish miles, although I suspect a few (maybe including me) could have a rest day at some point.
The biggest obstacle is finding cafes open in France for little refueling stops. We try and stop every 30 miles or so for at least a coffee.
Remember Mondays especially in rural France, they tend to shut up shop from lunchtime all afternoon. There could be very little open. We ended up in a bigger town getting food from Carrefor(sp) supermarket because of this siesta routine. Not a problem if you're aware of it.