That cohort already makes up nearly 48% of Audi's U.S. customer base, compared with 45.8% for BMW, 34% for Mercedes and 18% for Toyota Motor Corp.

WSJ: Upstart Audi Pulls Up Alongside Luxury Kingpins

Worldwide, BMW Group deliveries were up about 8 percent year to date to more than 1 million, a record for the seven-month period, the company said.

FORBES: When Driving A BMW In Russia, Better Make It All-Wheel Drive