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below is link for quite comprehensive honda exhaust information - though not Jazz specific, it provides good explanations

http://www.team-integra.net/sections/articles/showArticle.asp?ArticleID=2

Folks,
Have a look at

http://www.lubedev.com/smartgas/additive.htm

applies to all ..perhaps..
I have been using as per instructions but too many variables to conclude anything yet ..
100%...

40,000km service at $470 on 29/4 1.5 Jazz VTIs
car definitely runs much better after service
1.5 jazz apparently has platinum spark plugs replace at 100,000Km
1.3 jazz spark plugs need...

I get between 6.3 to 6.9
unleaded