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I have the economy lights in my 1993 Toyota Carina E. The ecu controls them, and they seem to operate on map-sensor output (~engine load). The orange light switches on when vacuum is high as to indicate the engine is working too hard to get good fuel economy. Looking at my mpguino, the light seems to switch at 9L/100km in highway driving = only when accellerating. I have noticed the economy lights are of no use in normal driving.
A vacuum gauge or a mpguino is much more helpful. Maybe a oxygen sensor signal meter to try to stay in closed loop?
If you really want the economy leds, I would suggest a comparator circuit for the manifold absolute pressure (map) -sensor output as to determine a specific load to stay under when driving. This only works if your car has a map-sensor...
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