Quote:
Originally Posted by ntron1
If you go to neutral, the fuel economy is better because there is less drag from the transmission.
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But your engine burns gas to keep it idling. When you coast in gear it's your wheels spinning, moving your gearbox that keep your engine running at speed so no gas is used. The drag from the moving parts (and it's actually mostly caused by the vacuum created in the engine sucking in air while it moves without fuel) is actually what gives you engine breaking, and can help save your brakes in the process.