Learn to drive by the feel of the engine's purr. You can predict what the lights would be doing if you were paying attention to them by the subtle vibrations in the car, getting just as good FE. If this were some other car, I'd say to learn based on the noise of the engine too, but the Civic's is too stinking quiet.

And slightly more on-topic... both indicators show fine on mine, lower at about 800-1000 rpm for relatively flat ground. I can get it even lower if I try, but that's only when the engine is nowhere being under load.

...because you'll see me passing everybody at 90 miles per hour going up mountains.