I've been meaning to ecomod my Insight, but I've been discouraged by how poorly it runs in lean burn. I'd like to get it running well before any major mods. It's even frustrating to hypermile. Also, it gets 60+ MPG already. 100 MPG would be nice.
I did recently install a front belly pan. Just some random sedan trunk floor panel that fits perfectly. I removed the power steering motor. And installed LED headlight bulbs. And a grill block. Nothing that made a noticeable different without controlled testing.
I'm currently running oversized tires on heavy steel wheels. Not good for MPG, but $60 for a set of tires on wheels sounds pretty eco! I have proper Insight tires, just need to get them mounted. But I should probably refinish the crusty wheels first. Or mount the tires on the lighter donut wheels after making them anything-but-yellow. Or continue to procrastinate.