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Originally Posted by Samson
This is true of pretty much all newer cars. No fuel is needed to keep the engine spinning when you are coasting down in gear. When putting it in neutral and coasting, fuel is needed to keep the engine running.
So, you use less fuel if you just coast down to the lights in gear, plus it saves your brakes. Downshifting during this process isn't really necessary on mostly flat ground.
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That wuld make sense to me. If the computer reads the tps fully off it would send enough fuel to keep the engine at idle. If the RPMs are already higher than what it's supposed to be, then it would give less and less fuel until the RPM comes down to where it should be. Alas if you are idling in nuetral the engine needs fuel.
Ken