Overnight shipping may get your package there in a jiffy, but it also uses a tremendous amount of fuel (not to mention money) to make it happen. If it doesn't absolutely, positively have to be there overnight, opt for ground shipping, which uses more fuel-efficient trucks to move packages. One insider tip? If you ground ship between major cities that are close to each other, the chances are it will still arrive the next day at the much cheaper ground-shipping price. Ground packages between Philadelphia and New York City, for instance, almost always arrive the next day this way.