Looks like you are not willing to take my word.
Just do a search on “1KR-FE Toyota Engine” and you will find loads of threads about cars using this engine. For example http://en.wikipedia.org/wiki/Toyota_KR_engine .
If you go to the UK site of Peugeot 107 (http://documentation.peugeot.com/default.aspx?country=gb&language=en&model=107 )and look at the owner’s manual it details the engine oil capacity etc. The image that I have posted is from that manual.
BTW, I have a 2005 model Vitz and I have changed oil and cartridge about twice so far. It takes around 3.2 L of oil with filter change.
I could not get hold of any manual for the JDM Vitz (even the Japanese one) and the only one that I have is for 1.5L Yaris. Both the engines are different so the engine specification will be different. Rest of the specifications for JDM Vitz is more or less the same as that of 1.5L Yaris.
If you have some better reference than this then please let me know. I hope you agree with me now.