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Very interesting Neil. I do plan to do some work up front. Looking at your photos, I am wondering if you attached the belly pan directly to the axel. I was tempted to do that, but of course the axel moves with suspension travel, so I thought it risky.
I have a very smooth grill block for the upper radiator grill. I find that the Echo gets plenty of air just through the bottom grill. I also block half the bottom grill in the winter. I have yet to test any of these mods, since it is winter and I'm away from my "test track."
I tested my fender skirts and found them worth .7-.8 MPG, near as I could tell. Small improvements add up, but they are tough to measure individually.
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