Is it true that cruising in gear in your car does not consume fuel?

Filed Under (Cruising) by admin on 17-08-2009

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My car’s fuel computer says I am consuming 0.0 litres per kilometer when I am cruising in gear with my feet off the accellerator (gas) pedal (e.g. going downhill, coming up to a junction, or roundabout etc.) Is this true? How is it done? The engine is still running. I can hear it! Is the computer wrong?
If it makes any difference, the car is powered by a diesiel (gas oil) engine.