I mostly type using the index-to-ring fingers. Pinky works the shift and capslock. If I need to capitalize a letter, I enable, type, then disable the capslock instead of the shift. My right index works the spacebar 95% of the time, and occasionally my left thumb.
Drove my typing teacher nuts because I would consistently reach 70-80wpm with excellent accuracy.
I'm certain however that if I actually took the time to learn proper home-row typing, etc, I could reach 100wpm...
Someday I will probably obsess over this goal... Until then though, I like my way just fine.