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Originally Posted by JohnnyGrey View Post
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.
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That will increase your overall FE.
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No it won't! The turbo will decrease your 0-60 time, but once you hit 60mph, you'll have used at least as much fuel to get there as the N/A motor.
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Imagine a corolla with a say 1.3 liter engine? Impractical if N/A. Add a turbo and you've got a killer FE car.
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That was my original point. To get any FE benefit from a turbo, you have to use it on a smaller motor to push down the efficient BSFE regions. Slapping a turbo on the original 1.8L won't do you any favors in the FE department.