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Originally Posted by swineone
Nice observation, which reminds me: are these higher cylinder pressures harmful to the engine? In that case, if I'm trying to balance fuel savings with maintenance cost, trying to make the engine last as long as possible, maybe I should prefer less over more boost? Unless more boost is especially efficient.
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Considering it's built that way at the factory, and the very same engine has been successfully fitted to larger vehicles for a while in other markets, it doesn't seem to be so much of a matter of concern. Besides one engine which was plagued by a defective phasing sensor, the overwhelming majority of 1.0TSI engine failures I'm aware of had been on engines with aftermarket mods.
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My car's engine in particular has a 10.5:1 compression ratio. Not sure you'd consider that low; my previous car was NA and had the same ratio.
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Did you notice some engines with a smaller unitary displacement at each cylinder have a higher compression ratio than comparable engines with a larger displacement?