Some Observations regarding the "ECO" indicator and FE
There is a definite link between pressure on the Accelerator pedal and the "ECO" indicator.
For in-city driving, it's recommended that you reach a certain cruising speed (in my case 30-40 kph in 4th gear)and then keep a feather-light, repeat, "UBER-light" touch on the accelerator pedal. Watch the City maintain it's speed nicely, and the realtime FE bar jump ahead to around 20 kpl (sometimes even more), and the "ECO" indicator immediately glowing up in it's bright green hue.
The "ECO" indicator also comes up when you are idly cruising at around 15 kph on 3rd gear; an indication that it's independent of the RPM as well. I have tested it on several different RPMs on all gears, and there is no fixed RPM band for it.
For highway driving, maintain a speed of about 65-70 kph on 4th gear and 80 kph on 5th to keep the "ECO" mode on. Cross 85 kph and touch 90 kph on 5th
Also, I have observed that if you slow down to a crawl and come to a standstill while in 2nd gear while climbing an incline (even a gentle one), the City tends to stall. It's recommended to downshift all the way to 1st gear if you are getting ready to climb an incline. FE will take a hit (comes down to 2-3 bars) but your City's engine won't stall.
Reverse this for when you are going down an incline. Keep your City on a higher gear and just maintain your present speed without touching the accelerator pedal. The "ECO" mode will be on and the real-time FE meter will run crazy (sometimes touching the maximum of 40 kmpl!).
Also, don't brake all the way down when you need to slow down before a breaker. FE will take a huge hit. If it's a small breaker, slow down and take it easily. The new 2013 City's improved GC is a boon with this - it simply refuses to scrape. You can tackle that moderate speed-breaker easily: only the bigger (read "HUGE") breakers are your toughest opponents to tackle. Best way to deal with them - go across them at an angle, one wheel at a time.
For reversing, do it slowly, specially when you are turning while reversing. The ORVMs and the IRVM don't show the blind spots around you, and there is always the chance of a vehicle/motorcycle around the corner which you might tend to miss. Even a slight tap on the accelerator pedal will propel your City backwards quickly before you even realize it. Reversing in a straight line is never a problem though.
Seat covers for the seats are advised. It is a pain to maintain the fabric OEM
seats, specially when small bits of particulate cloth (or cotton bits) tend to get stuck on them.
I am nearing the 1,100 kms mark and it's been a rocking journey with Sabino so far. Looking forward to the milestones ahead.