driving efficiently

[HAULN-SS]

A LOT of confusion and misinformation in this thread.

First Deersty, your wrong. Most cars do shut off the fuel injectors when your in gear and slowing down. First clue that your injectors are off, is wideband A/F. When you are in gear and slowing down, you will notice the wideband goes straight to LEAN. This is because no fuel is being injected. Also, next personal experience and clue aside from talking with many knowledgeable people about it.....is OMG, look at your injector duty cycle. When I am slowing down in gear, it goes to???????? Yes! 0%.

This is only true for manuals. For automatics, there would be no hydraulic pressure to keep the clutches engaged to keep the RPMs high enough so that the injectors stayed shut off. So the RPMs drop to just above idle, and fuel is delivered. Now, I'm gonna go out on a limb here, and say that most cars are automatics.