Something I noticed, when switching to neutral at a long light, when I switch back to Drive (automatic transmission), I get quite of a "jump start" (like, quick acceleration) when I tap the gas. Whereas, normally my Rio is slow to accelerated (4 cylinder). But switching to Neutral when stopped, I notice this "pep start" when I switch to Drive.
So, perhaps gas is still being "used" while in Neutral?
But since It's not in "drive" (and my foot on the brake petal) - the car isn't trying to move itself, so it "saves up" the gasoline/pressure to give that peppy startup when I tap the gas?
lol, it's weird, but it makes sense anyways :P