Fait mathématique: 80511 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 80511 is an uninteresting number.
Date historique: June 6th is the day in 1932 that the Revenue Act of 1932 is enacted, creating the first gas tax in the United States, at a rate of 1 cent per US gallon (1/4 ¢/L) sold.