I'am from the Netherlands and just became a owner of a civic 96 vtec-e (ek3) and in Europe the 6th gen. civic vtec-e models do have a green leanburn eco-indicator light.
But about the driving style, I'am also wondering what's the best way.
In 1th and 2th gear the lean-burn modus doesn't activate, so I give it a bit more load so I can shift as soon as possible to 3th gear and reduce pomping losses.
But most off the time I notice that you will slow traffic down, trying to stay in the lean-burn mode will accelerating, so then I give it about 3/4 load.
And up to speed return as quickly as possible to lean-burn.
What I noticed is that when you have to accelerate harder and thus leave the lean-burn, you can actived it sooner (if your on a constant speed again) by lifting the gas and give it gently a bit off throttle again.
What I found interesting is that you can realy notice when my d15z6 (obd2) ecu is testing if the (norraw-band) lambda works by enriching it a small bit and thus it accelerates a bit, without me moving the throttle.