Stats of my car...
Honda City IDSI mid 2008...
195/60/R15
Within City with Partially A/C on... 12 to 13.5 KM/L (lets say half time A/c on)
Within City without A/C in winters... 14 to 15 KM/L
GT road with A/C full time on... fan speed 1 (18 to 19 KM/L).. Speed mostly @ 100 KM/H and less...
Motorway...partially A/C on... Speed 120+ KM/H almost all the time... 140 KM/H for half an hour... touched 160 couple of times.... Fuel average around 13..
It gives best fuel economy while driving under 3 RPM
It has less initial pickup so don't dare to do a drag race with corolla or new city
Overall an excellent car... Drive comfort, fuel economy, space etc...
Regards