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Which knock property does natural gas offer?

  • A.A low octane rating, which limits the compression ratio that may be used in an engine designed for the fuel
  • B.Nothing
  • C.Excellent resistance to autoignition, which permits a higher compression ratio and therefore better efficiency
  • D.A very high effective octane rating

Answer: D

Methane resists knock far better than petrol. The last option explains exactly the benefit that follows, which makes it a correct and more instructive version of the same answer. The shared behaviour explains why these belong together and the differences explain why both exist. Naming what changes and what stays the same is the reliable route through questions of this shape. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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