Glad to hear you're getting such great mpg with the Mazda 3 - I agree the technology is far more advanced. I've no experience of the 1.6 but the efficiency you were getting seems poor; I managed 13.7km/l on my last tank with my Aveo 1.4. There's a video in the Sonic forum of the sticker EPA being 25/35 city/highway.
Since buying the Scan Gauge e from this forum, I've noticed how every stop, acceleration and idle is where the mpg gets sucked down. I can see the sense in Hybrids as using EV mode when stationary or slow really combats the waste of having the engine on.