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Originally Posted by B440
I owned a Jeep Renegade with the 1.4L Fiat turbo engine and it was nearly impossible to stay out of boost in any real world driving.
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Sometimes a seemingly undersized (and underpowered) engine might get worse fuel-efficiency in a naturally-aspirated trim.
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The Subarus have 2.0-2.4L engines that could be NA and still motivate the car (no boost). The Renegade would be a turd if the 1.4L was NA (no boost).
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Since smaller engines are usually supposed to get driven at a higher RPM than it would be actually needed with a larger engine in a comparable setup (either NA or turbo), plus turbochargers fitted to small-displacement engines nowadays are often smaller in order to increase boost from low to mid RPM and some downsized engines are actually not so rev-happy at all compared to bigger NA engines, getting out of boost becomes effectively out of question.