Try visiting mycarforums.com to get better info. They have some
serious car fanatics there.
The Honda city is one ugly bugger...but i came across a guy who did
some self-maintenance, changed engine grease and so on and achieved
and FC of 19.7 !
My VIOS (M) maxes out at 17.5 and i'm a highway traveller.
Sunny's FC can't conpare with those two but some forum pages
describe the engine as solid and durable. Of course, the Sunny is
the most spacious of the three.
You might want to check out the mitsubishi lancer too....that was
my 2nd choice before i decided on the VIOS.