Technically, the Dalton is 420 miles long, but that is because it starts about 85 miles north of Fairbanks. The first section is part of the Steese and Elliott Highways which are all paved, including some pavement that was so new that it wasn't finished yet.
Speed limit was posted at 50 although the trucks run faster when they're empty.
Gas was $5.20 at the Yukon River Camp at the lower end of the bridge on the left. There was a BLM Visitor Center at the lower end of the bridge on the right, almost under the pipeline.
There was also a very nice Arctic Visitor Center here on the opposite side of the road.
There is about 20 miles of very new asphalt north of Coldfoot past Wiseman.