I don't recommend the Neutral thing. I am no expert, but I suspect that you are also killing your regenerative braking when you do that, so you now have TWO actions to take in panic stop -- Shift and then brake, so the delay could be critical. Also, B position utilizes more of the engine compression braking, which decrease mileage, recharge energy and increases engine wear.

City driving at 50 -- no probelm. I have A trim, so I don't know how it looks on nav display, but wait a little before leaving the light to open up some space. Accelerate smoothly and fairly agressively so that both drives are on until up to just above 50. Back off on the pedal until you feel the traction moter cut back in on the low end. (In my car the MPG gauge suddenly "dives" right to 60). Maintain the glide with a little pedal if necessary, but keep the MPG gauge under 40 (it takes a light foot to do this). It works, as you can see from my signature -- that is a lifetime (albeit small one) mileage from the time the TCH was new.

Glide happy!

It is the ignorant among us that will eventually destroy us all.