Quote:
Originally Posted by PabloK
I don't think your grasping the concept of coasting.
The car is using more fuel when you engine brake opposed to a decoupled drivetrain / idling engine. Period.
The concept of coasting... Think about a red stop light a quarter of a mile in front of you on a 55mph road. You let off the gas and you can easily coast to the light without the engine slowing you down so fast.
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The AA (a UK breakdown service and driver organisation) seems to disagree:
http://www.theaa.com/motoring_advice...ive-smart.html
Quote:
With changes in vehicle fuel systems coasting won't save you fuel these days either.
Old car with a carburettor – take your foot off the accelerator pedal with the car in gear and fuel is still drawn through into the engine. Fuel savings could be made by coasting out of gear.
Modern car with electronic engine management – fuel and ignition systems are effectively combined and controlled by one Electronic Control Unit (ECU). Take your foot off the accelerator and the ECU cuts the fuel supply to the injectors anyway so there's nothing to be gained by coasting.
Modern diesel engines also have the ability to shut off the fuel when you take your foot off the accelerator.
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