Weird explanation of P&G.
Pulsing, then lifting the throttle, i.e. using DFCO ?
That combining 2 wasteful conditions
The Island of Great Fuel Economy, is the island of high BSFC.
Great if you need the power, but usually, like at constant speed, you don't.
I'll happily trade high BSFC conditions for low load, low rpm conditions.
35-45% @ 2000 rpm gives me best real FE.