Sky Castle

Erm, well, I can't read ahead while speaking either. Maybe to the end of the sentence in a pause in my speaking, but not much farther than that.

As for just reading to myself: I read really fast. Anything descriptive, I just let my eyes glide over the words and then a picture forms in my head. You know you're reading a good author when you don't even think about the words anymore, you just sort of watch the story unfold in a mental film.
Dialogue, however, I do thend to notice the language. The characters speak the words in my head. Each character has their own voice and I just sort of hear that.
When I'm reading a story meant to be read aloud (like Aesop's fables for example), there's a sort of generic narrator in my head who reads the story, but in fast-forward. It's funny, because it really doesn't sound fast in my head and I hear the cadence of the story just as if someone was reading it to me, but it just takes about 1/3 of the time ;-D