I've gone through all 9 replies, and no one said that VITZ is better than CITI.
In my suggestion,
VITZ is Certainly a good car with respect to fuel consumption. But conditionally you have to use good "Gear Oil" (especially if its CVT engine) and most importantly Fully Synthetic Engine oil.
If you full fill these oils demands of Vitz, then its better from every aspect for sure.
Cheers & LOVE.