I type with mostly my right index, ring, and thumb. I do some typing with my left index and ring. I hit space with either thumb or whichever finger is closest. Back when I was in keyboarding class and practiced every day, I hit 200wpm on a fairly regular basis for our tests. But copying text and typing what's in your head are two different entities entirely. I guess for chatting and paper-writing I type slightly faster than average. I don't really know, though. I wholeheartedly doubt I can do 200wpm any more.
. . . I don't know where the keys are in relation to my fingers, I know where the keys are in relation to the board. I think it's much better, because I can type one-handed or peck-type with an object much faster than a homekeyer can ever hope to.