Quote:
Originally Posted by Eagle Creek
Imo this would only be beneficial at modest declines for a reasonable amount of distance. At more steep declines keeping it in gear the weight of the car alone should keep it rolling with 0 usage of gas. Does the car indeed detect this and in this case choose the keep the engine connected to the wheels?
I drove a manual KIA in France last summer, went down a hill in second gear and didn't have to give any gas for almost 5 full minutes. Just going down in 2nd and breaking ever so slightly every now and then. Absolutely no gas needed.
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It's a bit late to reply to this now, but engines are designed so that they save more fuel if you leave the car in gear and coast compared to putting the car in neutral and letting it freewheel. The engine shuts down the fuel flow even if the drive is engaged. It doesn't do that in neutral.