Quote:
Originally Posted by cRiPpLe_rOoStEr
Considering that those 3-cyls usually have a larger stroke proportionally to the bore, they perform better at lower RPM, thus leading to the expected fuel savings.
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Bore/stroke ratio has very little to do with this. You should thank turbos, cams and compression ratio for torque at lower RPM. I'm surprised how often people think, that these 3 cylinder engines will run at high RPM when in reality they don't need high revs in normal driving. Downsizing comes with down downspeeding.