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Your new car is 600lbs heavier, has about 10% more interior volume (probably correspondingly more frontal area/drag), and 25% more horsepower. The Corolla was already pretty near top of the food chain in 2000 and the 1NZ is a great engine - basically the same engine is still sold in several Toyota models.
Anyway, looking at the BSFC chart you posted, it appears the SkyActiv engines don't so much have a better peak BSFC (though it's very good), but rather a much larger area of high efficiency. With many cars, dropping out of the ideal rev range has a much larger impact on economy.
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