I can sight read if you give me long enough- I used to play alto sax so I had to back then. But time has moved on and I've changed clefs... so it's a long slow process for me. Anyway, I can tell you that the low E or B on my basses (4 string vrs. 5) are all under the low line on the staff. I don't know how that translates onto the G cleff for guitar, but... ah... I probably just confused the issue...
I'm going to shut up now.