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Your Honda Jazz is light, not particularly aerodynamic, and has a tiny 1.2L 75hp engine. Each of these characteristics will give it better city mileage than highway mileage. Most cars get significantly better mileage on the highway because they have a higher weight-to-drag ratio and engines that are really oversized for city driving.
I wouldn't be surprised if your car got peak fuel mileage at a cruising speed as low as 25mph. If you have good hypermiling techniques there's no reason your city mileage shouldn't be close to your highway mileage. Hypermiling techniques are also much more effective in the city than on the highway. On the highway there's not much more a person can do than reduce speed and be mindful of how you handle hills.
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