See my comments below.
Here's my personal opinion:
White = Young ppl like. Esp white with a black bonnet (to me super ugly). But white deflects heat so that's good. It is very common, though.
Black = If u like to drive around an "oven". Black absorbs heat and not practical for our weather.
Silver = Super common. But can look good if u maintain the shine.
Blue rock = To me, it looks rather unattractive.
Elegant Brown = This is a new colour so u won't see many other models with same colour. I had doubts at first. But after selecting this, the colour tends to grow on u and I am beginning to like it. The name "elegant" is very appropriate as it resembles gold colour. I think older folks will like this. After getting this, I have managed to get matching brown umbrella, even tissue box that complements the colour. 

At the end of the day, diff ppl will have diff preference lah.

Most definitely can. Let's say fc is rm50 can go 200km. That the worst fc for  it.
Then rm350 can go 1400 km