You have got to be kidding me right??? Butane has an odor now? Last I checked butane was an orderless solvent.
Why not admit there are mercaptans in all butane that is not labeled mercaptan free?
I am not going debate that butane smells and tastes like light petroleum. It is a point of fact that only someone grossly ignorant on the subject would question.
Since you have such keen taste and smell that you can detect mercaps in low parts per billionth, where neither I or any of the test panel members can, I am blown away that you can't smell butane
Perhaps after more experience you will awaken and admit that you are misguided?