The surveys have tended to reflect a long-running attitude among dealers of certain brands where relations have been consistently positive.
Lexus also took the top spot in the winter 2021 survey and the summer 2020 survey.
"We are grateful for our Toyota and Lexus dealers who continue to surpass customer expectations and take care of their needs," said Toyota Motor North America spokesman Victor Vanov in an emailed statement to Automotive News.
Honda, which ranked fourth in the summer 2020 survey and fifth in the winter 2021 survey, rose to third, while Subaru came in at No. 4, slipping from No. 3 in both the summer 2020 and winter 2021 surveys.
Porsche was No. 5 in the summer 2021 survey, dropping from No. 4 in the winter survey.
The second half of the top 10 saw somewhat more jockeying for position.