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You can (and should from time to time) check your brakes after driving by holding your hand close to the disks.
If one is hotter than the others that one drags.
If you have a OBDII gauge you can see your fuel consumption per hour when idling at a standstill.
In N I use just about 60% of what I use in D.
So even if N is no good for coasting it does save gas at the lights if you don't key off.
I have a CVT though, ordinary autos may act differently.
I don't coast in N as the Insight does not only DFCO but also does something with the valves to further reduce engine braking on DFCO.
In N it just idles and uses half the fuel per hour it would need to maintain a steady speed of 38 mph. No P&G with idling in N for me therefore.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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