can not tell you the route I took returning to Mi last year but mostly it was GOOGLE Maps on my android.. I did do a couple overrides. (I may still have it on another computer but doubt it).. No toll roads at all. I told Google NO TOLLS
I'm considering the same route come next spring. I got about 200 yards from the toll road at one point but. did not get on it.
I got the suggested route from others here.. So you might be able to search for it. Look for posts I made back around March or April 2018 and one or more will be in that thread. I was going to MD not DC but.. Well. 10 miles.