Funny, I have never driven according to the Economy meter.
I drive casually, i.e. gradual acceleration and gentle braking, when in a leisure mode, and not in any sort of hurry. Average speed, 0-100 km/p - approx. 13 secs, and pedal is depressed gradually.
When in an extreme hurry - which is seldom, I floor the pedal to get max revs, and shoot from 0 - 100 km/p - approx. 7 secs within, and thats when the gear changes at higher revs.
For max. fuel, I would use the casual drive mode.
126 tailed by a 203, 129 leading the pack.