Or in other words: Richie-rich New Yorker would have to make (100,000 * 367) / 21200 = 1731 round-trips per year to use 100,000 times as much fuel as the middle

Or in other words: Richie-rich New Yorker would have to make (100,000 * 367) / 21200 = 1731 round-trips per year to use 100,000 times as much fuel as the middle-class one. Quite possible if he possesses multiple aircraft to race against each other.