if ur planing CNG... no to swift. (liana and swift share the same engine dats y theres no Factory Fitted CNG Swift)
im not sure abt the Belta on CNG.
Resale. dude there arnt too many 1.0L Beltas on the road as yet so 1.3L is even tuffer to find and with the current duty structure 1.3L belta wud be more expencive. and seriusly ive seen more Swifts then Honda City;s on the road.