Just removed the ones off my eGolf. I bought a cheap ($15 + tax) heat gun from Harbor Freight. I put it in the "low" setting and made sure the surface of the sticker didn't get hotter than I could touch with my bare hands. I warmed it up to about 100-120 F, picked up one corner with my fingernail, and peeled it slowly, re-warming the exposed part of the adhesive surface.
That caused a pattern of "VOID" left behind, but I had a can of "3M Adhesive Remover" in one of my garage cabinets which I used to remove them.
There appears to be no sun fading after 44 months, but my car is garaged both at home and at work, so my car has spent little time in direct sunlight. I won't know for sure until the car is fully detailed and I can see it in the bright sunshine. It's gloomy and rainy right now.
Blue Ocean 2012 Leaf SV, lost that 1st bar at 34 months/26,435 miles. Lease returned 2 months later. Final LeafStat figures: 225 Gids, 17.44 kWH, SOC 91.89%, SOH 82.36%, 69.49% HX, 54.57 Ahr, battery temp 61.8 F.
Now driving a 2015 VW eGolf SEL.