I concur, probably just lighter materials in an effort to increase fuel economy. I remember reading when the 2009 facelift came out that they also made some improvements to the undercarriage panels to increase aerodynamics (for the same reason.) In 2008, the EPA (in the US) changed their fuel economy rating system, which resulted in lower numbers for most cars, giving manufacturers even more incentive to find ways to up the economy. Yes, I realize you're not in the US, but these changes would be beneficial worldwide.
I don't know if there is an appreciable weight difference between the FSI and TSI motors, but that was a big change between the two models too.
One last factor to consider: we don't know what options the cars that were weighed were fitted with. Little things can add up, such as power vs manual seats, even cloth vs leather, 17" vs 18" wheels, etc.
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