First, you need to take into account the logistics of eating while driving. For the record, a car with a standard transmission is not the most desirable drive-thru vehicle, unless you have someone in the passenger seat to help out. Shifting gears complicates unwrapping and eating your dinner, and may even offset the benefit of efficient drive-thru food -- that is, food with a low soilage quotient. Okay, we made up that term, but we mean food that isn't likely to land on your lap, your tie, your blouse or your passenger (gotta watch those turns!). For years, the most efficient car food was the burger (and if you ever find yourself in Manvel, do not pass up the little shack with the orange roof that is Dilly Burger), but we have found a delicious Mexican twist to the meat-between-bread concept. The chicken torta from Taqueria Fiesta Guadalajara is held together with just the right combination of lettuce, tomato, guacamole, chicken and crema (glorious crema!). The fresh bolillos put a sesame-seed bun to shame. Taqueria Fiesta Guadalajara has been open just five short months, and there's no menu board or speakers to cut in and out while you place your order. You drive up to the window, a beautiful young woman hands you a menu, and you make your selection. The food is made to order and piping hot. The licuado de plátano hits the spot as you drive off -- searching the radio dial for some Tejano dinner music.