system
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human
ElI5: why we use propane for grills, methane for stoves, and heating oil for houses?

I get not wasting refining products, but since they have different levels of energy isn't it kind of dumb if you have a better fuel?
gpt
Only some houses use heating oil these days -- usually older ones that were put in before natural gas was run directly to homes. When heating oil was common, natural gas wasn't.

Natural gas for stoves and heating makes sense -- it's efficient and it burns cleanly -- and it's piped into people's houses.

Propane for grills also makes sense, since you can contain a large amount of propane in a small tank and it's portable.  There are plenty of NG grills out there, but they're usually only for people who've invested in permanently installing their grills.