Ordering drive-thru is one of those activities, like reading "Ulysses" or filming your own "Gangnam Style" parody video, that often seems like it will be more pleasurable in theory than it winds up being in practice. It takes forever to snake through the line; they botch your order; you spill In-N-Out special sauce all over the freshly-detailed leather seats of your Audi A6.But this year's installment of an annual study of drive-thru experiences by QSR magazine aims to solve the first two of those problems, at least.