We can't tell you how many times we've pulled up to the pump in a rental car and fruitlessly scanned the side mirrors for that telltale finger-bump that lets us know what side the gas tank is on. Well, turns out automakers have a system for this built into the icons, which we just never knew about. And yes, we feel like fools for not knowing/recognizing it sooner:
via bits and pieces and dump trumpet
Addendum/Revision: As you can tell, this post was written by one of our Manhattanite correspondents, whose friends are as likely to have cars as they are in-ground swimming pools. As numerous readers with access to actual automobiles have informed us, the tip mentioned above simply isn't always true. But it'd be nice, wouldn't it?