[thackney]

, and being heavier than air would stay close to the ground,

Methane is much lighter than air. Unless trapped inside a building it quickly dissipates. Methane gas has to be diluted down to 15% concentration before it will ignite. By the time you get significant quantities diluted that much, it is well up in the air.

Much of Gasoline vaporizes into heavier than air gases.

[Red Badger]

Well, then I guess it’s okay...............