I've had 3 Jazz cars, all Milano red, none more than 3 years old, but perfect when sold on.
However, I've seen many other much older examples on the road and again no sign of any fading.
I believe the days of red cars fading in the sun are long gone.
So, why do i stick with Milano? I am a great believer in being seen on the road, unlike those with grey or silver cars, which seem to blend in with the tarmac. I accept that silver is probably the most popular colour around, but not for me.