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I own two <1 year old VW Polos - one with a 1.2L TSI(small turbo) "Bluemotion" engine, another with a 1.0L MPI(naturally aspirated) engine. The 1.2TSI is much more efficient on paper, but guess which one gets far better milage in real life? Bingo - the 1.0L MPI unit. I frequently get >50mpg on longer journeys in that car, while the 1.2TSI is more like 35-40mpg.

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The 1.2TSI is presumably designed to replace a naturally aspirated 1.6L or 2.0L, not to compete with the 1.0L.

Sure - but on paper it's better in every regard than the 1.0L, better mileage, better CO2 emissions, and it's the one that gets the "Bluemotion" badge which traditionally was only given to particularly efficient vehicles. Yet the smaller 3 cylinder engine is the one that is far more efficient here.

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