Good Car, poor mileage

Driving experience is very good but the city mileage since I purchased in November 20 was around 7 to 8.5 max in the city (which improved to 10 after last service) and on highway it was 14 to 15 that to if you drive below 95, if you go beyond it is just 11 to 12. I really wonder how people are getting good mileage for this car. Now pl. don't say it is on driving style etc. In my city there's no neck to neck traffic.