Each new model uses the same 3.0-liter V-6 turbodiesel engine and 8-speed automatic transmission to deliver strong performance and surprisingly frugal economy figures.
The engine produces 240 horsepower and a useful 428 lb-ft of torque, so Audi buyers still enjoy the sort of punch they'd experience from equivalent gasoline models.
Starting off, the 2014 Audi A6 TDI uses this engine to achieve EPA estimated economy figures of 24 mpg city, 38 highway and 29 combined.
Prices start at $57,500 for the A6 TDI, and there's plenty of equipment on offer. Audi's premium plus package is standard, with MMI Navigation plus, Audi connect, Xenon plus headlights, parking system plus, 18-inch wheels and no doubt some other plus-badged goodies.
With $66,900 in your back pocket the 2014 Audi A7 TDI becomes available, with identical gas mileage figures to the A6 on which it's based.
You also get striking fastback styling for your money, similar equipment levels to the A6--plus Wi-Fi and a 5.5-second 0-60 mph time.
Least expensive of the group is the 2014 Audi Q5 TDI, the marque's smaller SUV model and an alternative to the existing Q5 Hybrid.
$46,500 gets you behind the wheel, $4,400 less than the Hybrid, and economy figures of 24 mpg city, 31 highway and 27 combined are marginally better too.
The same 240 bhp engine found in the A6 and A7 drags you to 60 mph in 6.5 seconds via an 8-speed auto transmission, and again equipment levels match those of the sedan and fastback Audis.
All vehicles should arrive in Audi showrooms from late Summer 2013, and if none are quite what you're looking for, Audi also confirms its A3 Sedan, arriving in 2014, will also have a clean diesel engine in its range.
Follow GreenCarReports on Facebook, Twitter, Instagram and Google+