I've have these on for a week or so now, and finally got around to snapping a few pics. They are noticeably lighter than the OEM wheels! I didn't get them on a postal scale but held an OEM and a Kosei in each hand and could easily feel the difference.
I had a set of Konig Helium Ultralight rims on my HCH and saw a +2mpg gain, hard to tell if it was the wheels or the tires or both but they did weigh about 8lbs less per wheel/tire and that's a ton of rotational weight.
2001 Insight CVT - Current tank average 56mpg
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