last time i heard the average ADOS - is 22% European
Estimating African American Admixture Proportions by Use of PopulationSpecific Alleles
https://pdfs.semanticscholar.org/9530/8cedffbbf5b030b2193ed6fb84287dabf71f.pdf"What they discovered contradicts some of the previous studies on the subject where it was thought that Blacks were about 30% white. They conclude that the average Black American is 17-18% white. But this is an average and it depends on the location. When geography is factored in we find that there is a wide range of mixed blood. The most African are those of the Gullah Sea Islands off the coast of South Carolina and Georgia. This is also a logical conclusion based on the history of these Islands. Africans who were imported here were rice farmers who as slaves outnumbered whites by the thousands. Because of their large numbers and the absence of whites they were able to keep some of their African culture. This accounts for their “Caribbean” sounding accents and more prevalent West African features. The study concludes the Gullah are only 3-4% white. On the mainland in the South Carolina “Low Country” and near Charleston the percentages move up to about 12% which is still lower than average.
On the other end of the same spectrum Southern Louisiana (New Orleans) And cities on the West coast had some of the highest averages of white DNA at 23-26%. This is also not a surprise, knowing the history of these regions. Southern Louisiana was once settled by the French and Spanish. There are a large numbers of Blacks here who are more than 50% white. Many of whom would not be recognized as Black by most Americans. Migrants from this area moved in large numbers to the west coast rather than the industrialized north during the two great migrations. Here they mixed even more giving us the percentages at the higher end."
More. Look at the autosomal DNA which is admixture(not mtDNA or Y-DNA which are just haplogroups).
Again little Euro ancestry. In fact with more DNA studies ADOS are actually scoring more African. In fact Southern ADOS score around 80-90% African on average.