Unfortunately corporate holiday limits time available to 3 day trip - and have already booked Dover
Sensibly, given the limited time you've got available and the distances involved, I'd suggest the A16 past Boulogne to Abbeville (used to be toll free Autoroute, but I'm not sure today), then the A28 at least as far as Rouen.
By the time you've negotiated Rouen
you may be ready to pick up the A13 and then the A28 again to Le Mans.
Perhaps not the idea M3W route, but practical; otherwise it could be all Route Nationale journey and little time at Le Mans...
On second thoughts the latter may be quite a good outcome
depending of course on your objectives
P.S. Just thought... you may need to watch out for all those Spitfire green M3Ws with the bullet hole decals given your TM moniker, hope you've got a tail gunner
