406C Consumption Manual vs. Autom.

Hello together, I play with the thought of buying a used 406C pinin, in which I would have 2 questions to the experts and/or owner of this noble piece automobile: 1. In the official 406C brochure the consumption of the 3L V6 207PS with 10L/100 is on average, the automatic version of the same however with only 0.4L more, i.e. 10,4L to 100. Is this only a theoretical value or does the version for one-legged really consume only so little more? 2. if I use this 3.0 L Version 10km to go to work, then I only heat the car unnecessary or does the engine actually get warm at such a distance? So, long speech short sense, I look forward to every answer. Greetings, a coming Peugeot driver donjoe1980