Li10up-
The trick is to just LOOK like you are making haste. You do NOT want to rush across an intersection (dangerous)- or down a narrow road section in the middle of the lane on Main street for that matter. Someone is liable to throw themselves in front of you and if you are speeding you won't stop in time.
When you are in the "take the lane" part of your ride, you need to be cautious and not rush. BUT- keep pedaling. When you coast without pedaling, it makes car drivers frustrated and subtley encourages them to try to pass you. If they see your legs pedaling they subconsciously feel you are moving faster and they will tend to have a few extra seconds of patience until you can safely move to the side again. Keep pedaling and LOOK like you are moving quickly, but stay steady without speeding up dangerously.