Degrees of madness

How does this all work then? I want my mileage in miles per gallon though I only know how much petrol costs per litre. I want my low temperatures in Celsius so I can say it’s ‘4 below zero’ or whatever but I want my high temperatures in Fahrenheit so I can say ‘it’s 85 degrees’. I want my big distances in miles but small ones are fine in centimetres. I would never of course consider measuring anyone’s penis – but if I did it would absolutely have to be in inches. Am I normal?