There's a lot of resistance to metric. Getting used to a new system is always traumatic for some. Some industry has difficulties, too, but surprisingly to some is that other industries already do everything in metric, and covert results back to English for their advertising and PR. Even I who have been using metric since about 1950 can't make fast conversion of galons to liters. Length I can do easily if you don't need much accuracy. (legally and scientifically exact- 1 inch = 2.54 cm). Weight I can only remember approximately 2.2 pound per kilogram. My scientific calculator had the conversions stored in them, but it went caput, and I haven't tracked down who now sells it retail in my area, and my 'math' one doesn't have them. Someplace on my hard disk I've got them stored along with the latest CODATA values of all the fundamental constant of physics, but I haven't used them for years, and don't know where I put them. And even if I get a laptop I'm not likely to carry it around when I go shopping.