Re: What measure of 'drink' did these Americans use?
Probably US sized Pints of Bud Light which is as close to gnat's piss as I've ever seen.
Now if the study used 6X, T.E.A. or even Broadside I might be more inclined to believe it.
speaking of T.E.A., memo to self to pop into the Brewery Shop on my way home tonight for some although the Surrey Nirvana is good on hot days.