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Ron the hybrid-battery-repair guy had used velcro to attach moon discs to his Insight, and reported no problems over long distances. I don't know how he stuck the velcro to the wheel or disc though. (Useful, aren't I!)
I'd be more comfortable with something more secure. To avoid drilling the wheel, you could fashion a sort of plug that fits through from the back of the wheel and slots into one of the openings. Then drill/screw into the plug.
You will have to time the runs, not measure their distance. Using a video recorder on the speedometer would be more accurate than eyeball/brain/stopwatch. Changing your speedometer units to km/h should be slightly more accurate still (higher speed resolution).
I still don't think you'll be able to detect any difference, above the normal variability you'll get from multiple runs. Don't let me discourage you though!
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