Typo in Audiworld specs?

[Martin W. N. Suryadarma]

Hi everyone.

Okay, I have limited technical knowledge, but as fas as I know, isn't 1.8L
engines = ~1800 cc, and 2.8L = ~2800 cc? But how come in Audiworld, 1996
A4 2.8 has 4172cc (169 cu. in)? 
You can see it here:
http://www.audiworld.com/model/historical/96/a4.shtml

But for 2.3L Audi 100, it seems correct:
Displacement:  141.0 cu. in. (2309 cc)  
http://www.audiworld.com/model/historical/89/100.shtml

Weird..