@virgosa2
I myself a cuore 2006 owner, its good on petrol n cng, though im running it only on petrol from about last 4 5 months and ma sha Allah its giving me avg of about 14~16.
AC is also good, but trips off in heavy rush or when there is long traffic jam (in start and go like driving).
Maintenance cost is just of avg. level, you can get parts easily from anywhere.
I would suggest that you should go for a newer model, as said above by shoaib.
you can also discuss cuore related topics here:
https://www.pakwheels.com/forums/wheels-fan-clubs/21615-cuore-fan-club-63#post4622984