This feature will save petrol if one has a lot of city drivings. when there is a mixture of city and motorway driving, the savings would be reduced. One thing for sure, the car must be maintained in top condition; i.e. when there is a demand to start the car, the car must start. In the initial year if the car is serviced by agents, this may not be a problem. The problem would come when one feels the agent is charging too much and decided to switch to road-side mechanics for quick and cheaper car servicing. Fortunately, car nowadays come with fuel injection system that make starting pretty reliable. My 25-year old Merc with fuel injection system can still be started with just one kick in the morning. One would have to work out if it is cost effective to save these few bucks as replacement cost of the batteries and motor starter may out weight the savings.