99% sure on this, i think most people were tabbing the bass bit to the chorus and pre 
at the same key as the chords, whereas in the song when you listen he plays it deeper

INTRO/VERSE/SOLO
G|--------------------|
D|--------------------|
A|-444-555------------|
D|---------4-55555555-|

OR simple variation to stop boredom (or maybe not XD ):
G|-----------------------|
D|---------455555555-----|
A|-444-555---------------|
D|-----------------------|

PRE CHORUS
G|---------------------|
D|---------------------|
A|---------------------|
D|-2222-4444-555/77777-|

CHORUS
G|-------------------------------------------------------|
D|-------------------------------------------------------|
A|-------------------------------------------------------|
D|-00000000-77777777-77777777-99999999-55555555-22222222-|

end chorus on
G|-----------------------------------------|
D|-----------------------------------------|
A|---------------------444-555-------------|
D|-00000000-77777777-----------4-55555555--|