Comparing the Camrys and Civics on Fuelly in those years, the Camry averages about 25MPG and the Civic is 31-32MPG. This isn't taking different trannies and trim levels into account, but I think it would be safe to say that mid-high 30's would be doable in a auto Civic.
For the LEDs, I don't think using green ones would make much difference for the blue parts. You might be able get a different colored overlay. I would check out Civic forums for more info.
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