well ahmad bhai, as per my experience with city and civic, the only difference is that of size, and features...
Power, stability and comfort are almost the same as civic also has a hardyy suspension like the city.
Yes power seems to be no different in both cars as city reponds to a full throttle the same way a vti responds to it...
Ever I see a Xli coming up hard in my rear view mirror, I simply let it come equal to me, give the driver a GRIN and push the pedal to the medal...
City simply pulls away like a dream as the civic does.
The "not too different" factor is due to the huge body design of the civic.
I actually feel like having more control over he car in my city rather than driving my dad's civic. Feels like :S to me as I know it starts "gulping in" petrol with every full throttle...