I don't need you or anyone else to explain conversions for me. I, too, spend time on both sides of the Atlantic. While I prefer to use a car and driver, I do occasionally drive when I'm out in the countryside. I knew what I was talking about when I made my first statement and I stand by that. Screaming insults won't change my position.
I was polite when you misunderstood the first time. Three times I get frustrated. Now I’m done.