Personal experience / First Impressions till now
One word answer would be; Fantastic! Engine and CVT are almost same as were in my previous ride, Passo, however, 1KR-FE in Vitz 2015 is a bit refined, improved and better as compared to in Passo 2013.
Personal likes / dislikes asides, but to me, its build quality, interior, exterior, aggressive shape and styling seems far superior and much better when compared to my last ride. It is spacious than Passo, and when you drive, you feel like as if you are driving a Sedan, Corolla to be precise. Suspension and handling is also much better than my previous ride.
However, only one thing is there which annoys; engine noise! and it seems more in Vitz (than Passo). Engine Vibration on idling almost negligible. Although, I think Vitz has better sound proofing than Passo / Boon, but engine noise is so annoying that sometimes I get a bit frightened.
Fuel average: 18.1 kmpl + within city, till now
(Best had been 20.5 kmpl from home to office and back)
Have started driving it since 02 weeks, after selling my Passo and haven't taken it on long drive yet, so can not say anything about its mileage on long route.