Hello -
I posted on this thread :
http://www.gassavers.org/showthread.php?t=1539
This thingy :
http://www.adcaps.com.au/pages/about.html
Question : Why not *extend* the cover beyond the diameter of the rim? Since the wheelwell must accomodate the wheel, it should accomodate a larger wheel cover. For the point of argument, let's say a cover that exposes between 1 and 2 inches of the side of the wheel only. Here is a before/after example of what I mean :
Problems : Hard to get your hands on these unless you have a taxi driver friend. System may not attach to small rim of Honda Insight. A flat tire would almost invariably SHATTER the (better be plastic!) cover because the current design is "defended" by the real tire rim. Maybe this is an excuse to go with 18" rims (heh heh heh, just kidding, the tires for those things go flat driving over ice cream).
This may be a no-show solution, because I still don't know IF the turbulence between the wheel and the ever-so-close wheel cover will be a big negative factor.
This does not give you the perfect cover that you want, but I think it is a safer compromise.
CarloSW2