Depending on what we are talking about, I use everything.
In LFS and driving it's Imperial (MPH, miles, miles per gallons, etc.)
At home, building something or whatever, again it's Imperial (feet, inches, pounds, etc.)
At work is where it gets confusing. I make and mold expanded foam plastic beads (like Styrofoam, but that is a brand name. I work with polypropylene and Polyethylene). We expand plastic pellets into foam with a pressurized reactor vessel up to 650 psi. In the molding press we use bar. And then to confuse matters even more, I work in the Engineering and Research department, so we have some pilot equipment that is 1/5th to 1/10th the size of our production equipment. We just got a new expansion reactor that has a gauge readout of megapascals and the pressure source reading in pascals. Our ovens are also all over the place some reading in F and some in C.
It's funny to hear the production molders say, "Wow, I thought the reactors were hotter than that. 155 degrees isn't that hot, our oven is at 175 degrees and we're in it all the time."
"Er, guys, your oven is reading in F and the reactors are in C! Go ahead and lay your hand on the reactor and tell me it's not hot!"