Here's a nice Wiley Coyote scheme for characters with CHEM skill: have them attempt to make octane booster compounds, like tetraethyl lead. Of course, failed rolls could lead to lead poisoning, insanity, and death. Success could boost regular gasoline to avgas octane levels, though.
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"Let's roll." Todd Beamer, aboard United Flight 93 over western Pennsylvania, September 11, 2001.
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