Sometimes the obeisance to style guides by newspaper editors and journalists looks not so much craven as robotic. The Telegraph provides an example. Like many newspapers, it has a policy of reporting distances in kilometers but appending parenthesized equivalents in miles (it's a conservative newspaper, and is not going to push its mileage-oriented readers toward metric units any time soon). Often that's useful: when it reports that The behemoth Airbus A380 … is capable of carrying 544 passengers up to 15,200km (8,200 miles), the parenthetical suffix serves to assist metrically challenged Americans and older Brits in forming an idea of what 15,200 of those little bitty European kilometer things might amount to. (At least, it would have done if it were correct, but as Bruce Lin has pointed out to me, it's wildly wrong: 15,200 km = 15200/8 * 5 = 9,500 mi. They're off by 1,300 miles. They must have meant nautical miles: 15,200 km = 8207.34 NM. That could be a life-threatening error for a jetliner running low on fuel. But never mind; who's counting.) Sometimes, though, doing such conversions is rather less useful.
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