Like others, when I'm doing any sort of mechanical work I use both. But this would swing between when I was a kid, foreign cars, classic American cars, around the house, or bikes. There was a era when US cars used both. What a pain.
But I would like to adopt other weights and measures. My weight in Stones seems so much less. Telling someone I social distance by Fathoms usually gets them to more further away. People don't question how far I ride in terms of Leagues; I usually say major. And for some of my more Biblical projects, Cubits is always a fallback.
John