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Originally Posted by JCL12
To Clarify: you are saying that when you coast in drive, all fuel flow ceases and engine RPM is maintained by absorbing the cars kinetic energy, effectively slowing it down faster but using zero gas?
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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
