I've been wanting to install some wheel covers on my car for some time. Only problem has been the 16" mag wheels. Well, I picked up a set of used winter tires and wheels this year from an old Dodge Caravan. They were rusty and I needed to do something with them anyway so I finally had my chance. They came with bolt on center caps which made it pretty simple. I cleaned up and painted the rims to stop further rusting and polished the center caps. Then, I cut some coroplast donuts to fit the rims and a set of aluminum donuts to cover the rims, glued them together and painted them silver. The center caps hold them in place and they don't affect wheel removal. I may not see much improvement in mileage though, since I don't usually do much highway driving in the winter, but, it should help a little. Here are some pics.
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Almost all my driving is done 1-5 miles at a time.
Best short trip: 2.4 l/100 km, 3.9 km