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I realized a 1-2 mpg improvement using snap-on stainless steel moon caps on my Metro (85% feeway speeds driving). I lost one on the first day, the second one about a week later. I bought replacements and bent the little gripper tabs so they would be a little tighter and hopefully not fall off again. That was a month ago (about 3k miles) so far, so good.
Speaking of theft, I put a set of the screw-on aluminum ones on a car back in 1983 or so. I wasn't satified with the supplied sheet metal screws, it looked to easy for someone to steel them as anyone with a bladed screwdriver could have them removed in minutes. I drilled and tapped the lip of the steel rims for #10-32 machine thread, and used button head allen screws.
They only lasted a day...
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