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Originally Posted by Even Steven
Yes, in a nutshell. It's not quite that simple, but the fact remains that a modern fuel management system has the ability to shut off the fuel pulse completely when a vehicle is coasting. Think of it this way--Why should the engine management system waste fuel by sending it to engine engine in a car coating down a hill? Fuel isn't required in such a situation, so it can simply be turned off. If you put the transmission into neutral while coasting, you are forcing the engine management system to start sending fuel to the engine to keep it idling. Therefore, it is more economical to leave the car in gear and coast down a hill instead of popping it into neutral and coasting down the hill.
Like I said earlier--do a little research and you'll learn all about it. I happened to learn this stuff in school  |
This is interesting. Is this same for manual transmission also? I tend to leave my shift on neutral when I'm coasting to stop. I would like to save gas for environmental reason if I can. haha.