What specific non-petroleum fuel did Rudolf Diesel famously run his engine on during the 1900 exposition?

Answer

Peanut oil

Rudolf Diesel showcased a potential renewable fuel source by running an engine during the 1900 Paris Exposition on peanut oil, demonstrating a vision beyond petroleum distillates.

What specific non-petroleum fuel did Rudolf Diesel famously run his engine on during the 1900 exposition?
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