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Originally Posted by curtis73
It also doesn't help mileage, in fact it can make it worse on modern EFI cars.
When decelerating in gear, the engine injects NO fuel since the transmission is pushing the engine. If you put it in neutral and let it return to idle, it is injecting fuel enough to maintain idle.
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Coasting in neutral with the engine idling your car will only burn 3l or so of fuel per hour. Coasting in gear you'll be burning no fuel, but will have to put in more fuel a short time later to regain the momentum lost by using the engine as a brake.