[reb01501]

Originally Posted by reb01501

Actually, this is the one I was trying to refute:
Coasting in Neutral or Gear to Save Gas - Coasting and Fuel Economy - Popular Mechanics

Oh! And the reason I think the author reaches the incorrect conclusion is that he fails to consider the lost momentum that needs to be regained at the end of the coast. Coasting in neutral loses less momentum so less fuel needs to be used to regain it.