I think instead of stopping the engine every time, changing the gear to neutral and waiting is also can give you some savings on fuel cost. Lesser the fuel consumed, lesser will be the pollution. That is why we should practice all
good practices so that the consumption of petrol will come less.
For individuals, it may not mean much but on a cumulative scale it will be a big saving of fuel.
Knowledge is power.
@ It is better to switch of the engine, if the vehicle is in perfect order, and if the waiting period is more than one minute. Petrol is prestigious - Save petrol for our future generation.
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