I have full moon discs ... and do fear that leaving my car on the street or in a commercial parking lot for a day or more may mean stolen hubcaps ... but it hasn't happened yet. One time, for a car left all day in a supermarket lot, I pulled them off myself and threw them into the hatch to be safe.
Keep in mind, you are adding a few pounds to each steel rim, though. The alloys will be MUCH lighter in total ... maybe 6-7 pounds in unsprung weight. This may be significant if you see a lot of stop-and-go traffic.
Lastly, I don't know the effect they have on mileage ... but my record keeping suggests it is very small ... certainly less than 1 mpg on my Civic. So, don't expect a significant return on your investment.
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--- Bror Jace
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