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a 2L 4 cylinder that's setup similar(target powerband) to a 2L 6 or 8 cylinder engine will be MUCH cheaper to manufacture, lighter, smaller.... all of which OEMs love to utilize.
if you go to some non-mainstream manufacturer, you might see oddballs in either direction(big 4s, tiny 8s), but for a large volume company, oddballs are too expensive.
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