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Originally Posted by JohnnyGrey
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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To get more fuel economy, you need to stretch them downwards. A smaller engine does just that.
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I agree, that's what I said in my previous post.
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Besides, I doubt even the most feeble economy cars need boost to reach 25mph quicker.
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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.