> By default, while I read something there's no auditory element at all.

I wouldn't characterize how I read -- which as far as I know is normal, but who can tell! -- as narrating to myself. Rather, it involves the sensation of somehow pronouncing words without necessarily hearing them. I can do this much faster than I could narrate the text explicitly.

I can also read without either narrating or pronouncing, but I find that it cuts down comprehension noticeably.