Way, way, way off topic, but:
> 
> There are all sorts of traditional units but the only one 
> that stumps most of us is oil -- we all know how much a 
> barrel of oil costs but relatively few of us know how big 
> that barrel is (~169 liters or about 40 US gallons).
> 
> Anyway, thanks to the Internet we're never completely 
> stumped, but even so sorry for the jargon.
> 
Still a little stumped, since 40 USG is surely 151.4 litres. An American
barrel is 42 USG, or 159 litres.

Colin