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Look up 'brake specific fuel consumption' maps. We have a bunch posted in the wiki link up top the page. It will show you that every engine is most efficient when it is loaded to around 80%. That is where you get your brisk acceleration from. If you had a smaller engine and still loaded it to 80% you'd just have normal acceleration, but that would be "too slow" for the average driver.
Cylinder deactivation is being used by a few OEMs. Everyone seems to do it a little differently. Its not really anything all that new.
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