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More specifically, how much does Start-Stop influence the official fuel consumption figures?
http://www.dft.gov.uk/vca/fcb/index.asp
 

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I've read that it only really saves fuel if you managed to keep the engine off for around 7-10 secs. The one annoying part of the V40's S/S system, is that the engine goes off even if you are doing 2-3 mph, so many times, I'm crawling behind a vehicle, engine goes off, and within 1-2 secs, the engine comes on again. I guess this way it acutally uses MORE fuel to restart the engine.



You can watch here...the impact of start/stop in a Fifth gear test...



 
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