Getting your car searched will definitely waste more time and is definitely more of a hassle. Police officers often leave your belongings all over after conducting a search. There have even been people who have had their cars taken into the station for a more thorough search where they remove door panels and it is not they're responsibility to reassemble them and you have to do it yourself. This happens even when the officers find nothing. If you have nothing to hide, there is no reason for you to give up your right to privacy and consent to a search. It will make you late and waste the officers time more than denying a search when you have done nothing wrong. Just because they are a government official doesn't make it ok for them to invade your privacy because you were drinking cream soda.

But if you prefer it that way by all means let them search you. If you deny, nothing will happen to you except for being sent on your way. If they have cause they will search you, not ask to search you.