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The only thing your map shows is that you could possibly retain your stock FE while accelerating faster. That's why the turbo stretches those BSFE zones upwards. To get more fuel economy, you need to stretch them downwards. A smaller engine does just that. Besides, I doubt even the most feeble economy cars need boost to reach 25mph quicker.
My four banger can crank out 130lbft of torque quite efficiently. Problem is, 90% of the time, I can't use it without soon ending up at an aerodynamically inefficient speed. While accelerating in the city, I can easily keep up with traffic while in vacuum, under 2K rpm. I have no use for boost, and I wouldn't suggest lugging an engine under boost.
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