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Its really very simple. With a closed throttle and engine revs above the figure set by the manufacturer (normally about 1000-1200rpm) no fuel is injected. It is all controlled by numbers on a 3D map in the ECU. This condition is met constantly while driving eg lifting off when approaching a junction and although its not a major fuel saving at £1.40 a litre every little helps.

You do not notice it working on todays electronically managed cars but back in the early 80's I had a petrol car fitted with mechanical fuel injection that had possibly one of the earliest incarnations of a system like this. It was horrendous, the lifting off on an icy road was simply dangerous and when the fuel flow started again it was not smooth transition.
 
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