[onehundred80]

Why would you bother to double clutch (double de-clutch) when the car has a synchro gear box? This means you use the clutch twice when once was good enough. The correct application of the throttle in time with the clutch on our gearbox precludes the need for the double clutching used on the old fashioned crash gearbox.
If you want to save the gear box and clutch, put it in neutral and use the brakes when slowing or stopping as brakes are cheaper than a clutch.
Keeping aware of developing traffic movement ahead of you and slowing rather than breaking at the last minute saves gas, brakes, clutch and gearbox. It also may prevent someone running into your rear end.