The real benefit from B Mode occurs when not driving in the city at the ideal speed of 35-40 mph,
but on hilly highways and/or at speeds of 55-60. B Mode can help 're-capture' lost range at the higher
speeds and some which was lost going up the hill. That's the reason Nissan supplemented ECO
with B Mode, i.e. greater re-gen from the higher speeds. When climbing some hills here in southern
California for a distance of 5 miles the range loss was 12 miles. Using B Mode on the downhill side,
the resulting net range loss was only 7 miles, i.e. B Mode helped 're-capture' 5 miles. Obviously
some 're-capture' would have occurred without B Mode and just ECO, but not as much.
Leaf SL MY 9/13: 66K miles, 50 Ahrs, 5.2 miles/kWh (average), Hx=70, L2 charges to 100% > 1000, max battery temp < 95F, min discharge point > 20 Ahrs