Seems to me some colors are more prone to fading than others. I suppose now adays they could add UV inhibitors/blocks but I don't know if they do and I seem to notice blues fading worse than other colors.
In addition to/instead of only considering fading, the dust/dirt/rain/sun/bird droppings, tree sap ...all those things add crud to the painted surfaces and can oxidize the paint surface. So in my experience, having a cover keeps the car looking much better with less washing/waxing needed and protects it longer between waxings. I think the Weathershield I got was top of the line of the lightweight, suitable for outdoor covers and it cost about $300.
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