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Originally Posted by SilverCrown9701
I have UltraGauge. I don't slow down fast enough with my engine on in neutral. My car seems to coast for quite a long ways.
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That's a good thing! If you have the time, and won't be annoying following drivers (who can't pass you), then start the neutral coast sooner. That'll save more fuel.
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My car has DFCO so that's why I figured leaving it in drive would yield better results.
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If you are *trying* to slow down faster than coasting in N, then using deceleration fuel cut-off in gear is more efficient than using the brakes. But coasting in N is generally more efficient than DFCO because you get off the accelerator (accel. or maintaining speed, burning the most gas) even sooner.
Also, your car only cuts fuel above a certain RPM, and possibly not at all in the lowest gears (your gauge may show you this). I recently drove a brand new Nissan 4-speed automatic that never cut fuel in 1st or 2nd gear.
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Shutting off at lights worries me about extra wear on the starter and ignition.
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I only know of one person who has worn out a starter while trying to save fuel, but he was shutting off at
every single opportunity, including pulse & glide (automatic). Driving a Honda.
Stopping the engine when the car is stopped is worth roughly 5-10% better fuel economy in city driving, which is why auto stop/start is now becoming common on new cars (including non-hybrids).
Whether you should do it or not is entirely up to you.