Yes, I personally know someone from each of those countries.

Ask a Brit where America is. They'll point to the US. Same with an Australian. Same with someone from Ireland. Same with a Canadian. Same with a South African.

But all that's besides the point. Trump is (unfortunately) an American and he's speaking to Americans. So even if it was just part of US English, he'd still have the usage right.

We had one gas station in my town in Oklahoma that sold it right up to the deadline. I used it because both my vehicles were built for it.

Cars made before the 70s need the extra lubrication in the valves or the engines wear out much quicker. Engines made for unleaded fuel usually have valve sleeves to prevent excessive wear.