I have purchased auto variant of ciaz in June 2018. I have already driven city manual 2015 for 1.5 years and cultus for 2 years. In my experience, ciaz is much better than city in respects of fuel economy, comfort, driving smoothness, space, drive pick etc. I have got mileage 16.5 km/l with speed 120 -130 km/h on motorway (approximately 340 km) and 150 km on local high way road. On return, I have got mileage 18 km/l with speed 110 -120 km/h on motorway (approximately 340 km) and 150 km on local high way road.I have calculated average on actual i.e. I filled tank with auto off of petrol pump from start and end of journey. The meter shows more than above described averages.I am very happy with this variant because manual city 2015 gives me average 15 km/l with speed 100 km/h and 13.5 with 110-120 km/l on motorway on same journey I described above.
This is CBU unit but built quality of Suzuki local assembled cars (like my cultus 2016) is very bad and extremely low quality material is used. In my experience local assembled cars of suzuki are not good and built quality of local assembled cars of Honda and Toyota is better.