However, $$LPG$$ stands for liquefied petroleum gas. It consists of propane $$(C_3H_8)$$ and/or butane $$(C_4H_10)$$ as the major constituent(s). LPG (propane) is denser than air as compared to $$CNG$$ (methane), which is lighter than air.
So, it is true that $$LPG$$ does not contain methane since it cannot be easily compressed.
Hence, the given statement is true.