According to Baidu map query, the driving route of Lvliang returning to Datong via Wuzhai is as follows:

Passing through Hubei Expressway and Erguang Expressway, the whole journey is 450.6 kilometers, and the whole journey takes 5 hours and 37 minutes.

If you choose not to go through Wuzhai, the driving route is:

It passes through Yin Qing Expressway and Erguang Expressway, with a total length of 466.9 kilometers and a total length of 5 hours and 27 minutes.