i know the basics,i know a bit more than basic actually. i think i should improve my english... let's start all over again,
1-if the car is in a gear and it is moving and you don't touch the throttle, the kinetic energy coming from the rotation of the wheels will go through the gearbox to the engine and keep the engine turning.
2-But if in neutral, no kinetic energy will come from the wheels because the gearbox won't transfer it.So the engine should be burning gas to keep turning.
nothing wrong with this.
Here comes the question, will the engine burn gas in the first condition?? i think yes.