So I’d break it down like this: of the 19 countries directly in the G20 (so not counting those only indirectly in it via the EU’s membership) - 1 has high degree of everyday use of non-metric measurements (US), 16 have low, and the other two are in-between, we might say medium (UK and Canada). That leaves 80% of the G20 in the “low everyday use of non-metric measurements category”.

Unlike the UK, Canada uses kilometres rather than miles for roads, so in that regard is more metric than the UK. Although I’ve also heard that some Canadians do crazy things like use Celsius to measure room temperatures but Fahrenheit to measure oven temperatures.