My mileage never varies. If I drive from home to the library by my usual route, it's always 10.3 miles. If my mileage varied I might make that drive tomorrow and have it be 5.7 miles, or drive it next Tuesday and have it be 37 miles. If mileage varied, nobody'd get to work on time because they wouldn't know whether their commute was going to be three miles or a hundred-and-three. Chaos would ensue!

I'd like that. We can always use a little more chaos.