The study measured the treatment of "mystery shoppers" who visited 6,157 dealerships throughout the U.S.
"There is no question that the typical dealership sells more effectively today than it did ten years ago," said Fran O'Hagan, president and CEO of Pied Piper Management Company, in a statement.
BMW, Cadillac, Honda, Infiniti, Lexus, Mercedes-Benz, Toyota and Volkswagen brands have consistently ranked at or above the industry average for each of the past years, the study noted.
Chevrolet, Land Rover and Mitsubishi brands have consistently finished below the industry average for each of the past five years.
Dealership personnel are doing a better job of such things as discussing features unique from the competition, according to the report. This happened 63 percent of the time in 2016, the mystery shoppers said.
Salespeople are also mentioning the availability of different financing or lease options more frequently. The study noted this occurred 79 percent of the time in 2016.
Edmunds says: This study is a critical barometer for any car shopper seeking white-gloves treatment at dealerships.