I know there have been a lot of discussions where lightweight wheels have come up as a way to improve fuel economy. But nowhere (yes, i've searched) have I come across any thread where before and after fuel economy #'s ahve been mentioned. I was looking at some wheels that weigh in at 10 lbs, and I have to assume that the decrease in rotational mass will improve efficiency under accelleration, but I'd like to know how much of an effect it has before I invest any money into it.

Please note, I'm only interested in people who have stuck with 15" rims with the OEM tire size. Any change to wheel diameter and tire size could change the results.

I've seen all sorts of #'s for the weight of the wheels on the HCH2, but they vary from 15lbs to 20lbs in what i've found. has anyone actually weighed their stock wheels?