Fuel tank capacity its 18 liters (approx 4.5gal), of which 2 belong to the reserve, which leaves us with 16l (4 gal) before turning the petcock. With the bike all stock the gasoline output is approximately 52 mpg, so in normal conditions you can ride without worrying a little more than 200 mi.
As for the mirrors, a popular modification is to place the mirrors of a Ninja ZXR6, which apparently are direct bolt on and have the stem a little longer so you can stop looking at your shoulders. Of this I can not give you more references, since I still have stock mirrors.
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -Albert Einstein.
2007 Ninja 500R