A reader in Singapore asks why their water authority still uses gallons. http://www.todayonline.com/voices/why-does-pub-still-use-gallons-metric-age#inside
The good news is that they get an answer and a policy change: http://www.todayonline.com/voices/pubs-use-gallon-line-msian-water-agreements (it just might be time to update the water agreement too, since both are metric)