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Dear Twitpic Community thank you for all the wonderful photos you have taken over the years. We have now placed Twitpic in an archived state.

Gasoline Wikipedia
As South Africa's largest city, Johannesburg, is located on the Highveld at 1,753 meters (5,751 ft) above sea level, the Automobile Association of South Africa recommends 95 octane gasoline at low altitude and 93 octane for use in Johannesburg because "The higher the altitude the lower the air pressure, and the lower the need for a high octane fuel as there is no real performance gain".