The best replacement for compression ratio is octane.

The best alternatives to compression ratio are rated as following:
★★★★★  octane
★★★  boost
★★★  octane rating
★★  cylinder pressure
★  expansion ratio
★  compression test
★  thermal efficiency
  cam duration
  fuel octane
  boost pressure
  compression psi
  ron
  compression pressure
  ignition timing
  octane number
  compression
  low compression ratio

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compression ratio
octane
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