This is an excellent reference; it's one of the few times in the trilogy details are made in technical terms.
Point 5 of what? Is it just 450 million kilometers per second? Seems hardly likely, since they're zipping between star systems in matters of hours. So is it, like in Star Trek, some logarithmic scale, where 1 is equivalent to warp 10, and you turn into a mudskipper.
However, The Empire is "The Galactic Empire," and the intro to IV implies the events take place in a single galaxy "far, far away." So all Wars travel is within a single galaxy. Trek ships travel the universe, visiting nebula and other galaxies. The distances between galaxies (millions of LY) dwarf those within galaxies (hundreds of thousands). Trek ships are vastly faster than Wars ships, by this measure alone.
