see your cars min req, for most of the car, its say 90 and
above.
however like same car, some use 92 say can, save money, its
working.
some use 95 say better. its hard to justify.
For any car higher then 1.6l my comment is, go for 98.... anything
below 1.6l cant feel much difference... however 92 and 95, my
personal experience is better mileage for 95 for altis..
However for picato.. 1.1l car... 92 and 95 doesnt make difference
to me....
Be adventurous do some testing your own 
Play safe? try 95 and 98
