I understand that the engine on the new Toyota Yaris is designed to cut out

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Stew

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when at idle, is this correct? - I understand that the engine re-starts when you move off again? Exactly how does this system work and is it any good? Is it not bad for the engine to have it keep switching on and off? And what about the safety issues if you need to move off quickly?
 
It is, with the new 1.33-litre VVT-i petrol Yaris, allegedly saves fuel and emissions in urban conditions by seamlessly stopping and restarting the engine at lights or in stationary traffic. They say this helps to boost combined fuel economy by up to 18 per cent.

Don't know about this particular car but, as JG says. the idea seems to work very well with other makes.
 
My mates mini has this feature which can be turned on or off. It is basically a fuel saving idea, the engine doesnt really shut off..just goes into a sort of not on state..haha i find it really annoying, can be siting in traffic and it sounds like you stall everytime you try to move off, i think it is as sonn as you put the clutch down it restarts :]
 
BMW have been using this system for a while, and I remember FIAT having it years ago - the engine cuts out when warm in neutral with the clutch released. It's un noticeable in normal driving, and moving off in a hurry is no problem - the car will always have started by the time you press the clutch, engage a gear & release the clutch again.
 
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