Piña colada is taking an early lead (apparently Rupert Holmes has brainwashed us all). But it's got me wonderin' why someone decided your car interior ought to smell like an alcoholic beverage. Is that what you want the cops smelling if you get pulled over? Sure, it would take several gallons of piña colada to impair the reaction time of an anorexic pygmy, but even so, I don't really want to invite suspicion.
Hey, I have a better idea for a car air freshener: Jack Daniels and bong water.