According to the Oxford English Dictionary, the use of super- evolved as follows:
In Australia and New Zealand, as well as in continental Europe, Super was the name for a number of years commonly given to leaded high octane petrol (gasoline). Originally the name denoted premium leaded petrol, as opposed to Standard, which was non-premium leaded petrol. However, with the introduction of unleaded petrol in the early 1980s, Standard petrol was discontinued, leaving only Super, which then became a synonym for leaded petrol in general. This continued until the late 1990s, when leaded petrol began to be eliminated in favour of various different blends of unleaded petrol contain special additives for use with leaded vehicles. The name of these blends varies from oil company to oil company.
In the United States, the word super is common shorthand for a building superintendent, an employee of the landlord who usually lives on-premises and handles minor repairs. The super may also accept deliveries for tenants, and represent the landlord to prospective renters. The word is also used for the superintendent of a dramatic production.
George Bernard Shaw used the prefix in his play Man and Superman, as did Jerry Siegel and Joe Shuster in naming their comic star, Superman, who has given the prefix to the whole genre of superheroes.
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