Now I've read your previous posts. How about taking the train from Annecy to "pick a city" in Burgundy and renting the car there, staying in a small town or village to spend 3-5 days exploring Burgundy. I stopped in Beaune for 1/2 day on the way to Alsace and it was enough for me. I skipped Dijon. The little of saw of Burgundy was really great (castles, abbeys, villages, weekly markets, beautiful countryside) and I liked being away from big cities. I based in Avallon for 4 nights, then Equisheim for 3, then drove to Strasbourg to drop the car and spend 3 more nights at the end of my trip. I had been to Strasbourg and Colmar briefly for the Christmas markets and was surprised at how much I enjoyed my second visit to Strasbourg. Wonderful trip. Yours is longer, so even better!