Hi,
I think it better to pump 95 grade to acheive better mileage.
We can save the money from using better grade petrol, to do engine flushing about $50 to $80.
I think this will prolong the engine life and performance.
I personally think that if we can hit aversge of 13 to 14km on our Latio.
It consider good.

Jazz can hit average of 15 to 16km, given the engine cc and brand.
So just enjoy our rideon Latio!!!!!!!!!
Regards
Alex