The best replacement for avgas is jet fuel.

The best alternatives to avgas are rated as following:
★★★★★  jet fuel
★★★★★  race gas
★★★  mogas
★★  autogas
★★  e85
★★  race fuel
★★  jet a1
★  pump gas
★  racing fuel
  auto gas
  avtur
  jet a

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Google Trends

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avgas
jet fuel
race gas