Thanks for the concern guys. You may be right; maybe the transmission will fail. @xulfiqar you know more about the inner workings of transmissions more than I can ever hope to know. For that, I keep your words in mind while attempting this in my car.
The first thought in a driver's mind should always be safety; his own, other drivers' and pedastrians'. The car should also be operated according to guidelines set by the manufacturer, to avoid fatal failure.
Now let me share a story about the car.
Back in 2010, my family was on a trip to Murree. Suddenly, the head gasket blew and the engine overheated, just as murree came into sight. We had no choice but to head back to Islamabad. My father turned the car around, threw the shifter into neutral, and shut off the engine. The car coasted like this all the way back to our home; all of 65 km. Occassionally, he would turn the engine back on to replenish the brake boost. Other than that the engine stayed off.The transmission suffered no apparent damage after that incident. To date, it still shifts like it shifted back when we bought the car. It shifts like a typical Honda; crisp and predictible.
Now, I have taken an interest in hypermiling. Not as a way to save money (although that is a welcome bonus), but as a challenge or a game. I am a speed demon at heart like all of us here. Crowded roads, lack of lane discipline, and traffic laws prevent me from speeding.
Hypermiling is a healthy and more rewarding alternative, if practised safely. I consult all the experts before trying any new advanced techniques.
@imrananr We will tell the new owner all the faults about the car, bro, don't worry . Its accident history, engine repair history, everything. Its original mileage is currently 260k km (and counting fast). The previous owner sold it as genuine and non accidented. The lie was revealed when the entire right side paint faded after 2 years . The new owner won't suffer the same deceit.