The most important thing is to avoid idling at all costs.
Then there is DWB (Drive Without Brakes), Potential Parking (park on higher ground when possible), EOC (Engine Off Coasting), and P&G (pulse and glide). You can read about them on the link in my signature.
These are the core hypermiling techniques in the city. The last part requires a scangauge/ultragauge, or even an mpgGUINO - even I don't have those yet.
BTW, the driver was Wayne Gerdes, the founder of modern day hypermiling - we can't get these sort of figures even with a fuel economy display, but we can still come close, and improve with practice.