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Even if they made you look up directions on your smartphone. Even if the cab smells bad and is playing shitty radio. Maybe not if they're clearly taking you out of the way to run up the meter or are falling asleep at the wheel (this has absolutely happened to me, it's terrifying). But still. If you already decided to blow the money on a cab ride, you can blow a nominal extra amount on a generous tip. It is the correct thing to do.