http://www.google.com/search?client=safari&rls=en-us&q=1+stick+of+butter+in+cups&ie=UTF-8&oe=UTF-8

So – google considers “1 stick of butter” to be a valid unit of measure. This is how I know that there are 32 sticks of butter in a US gallon, but 38.4304135 in an imperial gallon. Who’d thunk it?