I have put 1000 kms on the 612 in the past week so its time to share a few impressions. For context, about 650 kms were autoroute, 300kms on 2 or 3 lane D (departmental) roads, and 50kms around and in Paris. Weather has been cool but dry.
Fuel economy: 16.6 liters/100km (about 17 imperial...