This isn't the US -- these grades are from the UK. Although yes, the UK too is in this hybrid world where gas (petrol/diesel) is in litres, temperature is in C

This isn't the US -- these grades are from the UK. Although yes, the UK too is in this hybrid world where gas (petrol/diesel) is in litres, temperature is in Celsius, but vehicle speedometers are in miles per hour and feet and inches are very popular for height, measuring rooms and furniture, etc.