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If the car is in neutral, while coasting down hill, the engine has to use a little bit of fuel to keep the engine from dying.
If you leave it in gear it does not use any. Its the same principal as a bump start, only with fuel instead of spark. You don't technically need fuel to make an engine turn, just like you don't technically need a spark, compression works just fine in that case.
Depending on your speed and the gradient of the hill youre rolling down popping the car into neutral might not be such a bad idea since it will still be using a VERY small amount of fuel, and you'll get "enough" drive just from gravity and forward momentum, as opposed to leaving it in gear and slowing down more quickly....you won't cover as much ground.
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