When Manish Undavia took delivery of the 2016 Audi A7 sedan — list price, about $71,000 — it came with technology rarely found in automobiles, even five years ago: collision avoidance systems, sensors to keep the car from drifting and, perhaps most baffling to Mr. Undavia, a head-up display.
“A what?” he asked the salesman.
Richard Cardenas, a salesman at Biener Audi on Long Island, turned on the car and showed Mr. Undavia how it worked. From the driver’s seat, the car’s speed — “0 mpg” — appeared about six feet beyond the dashboard, floating in space, visible only to Mr. Undavia.
