Not only No, but HEEL NO....
The speed limit is supposed to be a speed limit. Unless there is a posted minimum, you get to drive what ever speed you like*.
* Some places have Impeding laws.
We seldom exceed 60 even on the 70 roads and when we are in Ohio, we do 50 on the turnpike just to annoy them. The troopers there do target out of state plates.
If you are not in a hurry, there is no reason on God's green earth that you should rush just because other people are in a hurry. It is a considerate thing to do to not cause too big a tail-back. The only place I know that has laws about that is Alaska, but they only have 2 lane roads in most of the state.
Matt