If there is any sort of silence...i'll let it be for a little bit to see how she reacts to it. Usually if my gut is saying that she feels nervous about the silence i'll ask questions that I'm interested in. Example: I love music...so I'll ask her about music, such as "what genre of music are you into?" to follow up (if she didn't already answer) "which is your favorite band?" to follow up again, "What about that bands music do you find interesting?" There will always be awkward silence...whether it be right now when you are first dating or in the car when you are already in a LTR with a girl for a year. Don't let it phase you. Hold your frame. The idea of you even thinking that any silence = awkward silence is you believing you have to hold yourself or the date to a standard of hers. If you play that game, you've already lost.