D?My 2016 C200se estate is on 176,000 miles. My tip, would be to drive in economy mode and coast down hills on the motorway at 70mph and 700rpm with the 7 speed automatic in D(as opposed to D1-D7). D means the gear box isn't driving the wheels. Keep the start stop off. Its ex lease (roadchef company car) and I bought it at 154k in October 2019.
Do you mean N?
Anyway, I’m not sure coasting actually helps anything. What’s your reasoning for doing this?
My old E-class had 475,000 on it before I sold it and that never coasted anywhere. Different engine etc but still, you canna change the laws of physics!