All Models
- The 2013 Audi Models
  Progress is the driving force behind everything we do. It is the result of meticulous design, exhaustive testing and inspired engineering. And ultimately, it is the birthright of every car we build. This year, a new generation of progress is taking hold.
A3
- The 2013 Audi A3
  Starting at $27,270*
  - View A3 Overview
  Why should those wanting a compact, efficient* car settle for less quality or driving pleasure? The Audi A3 may cast a modest shadow, but its handling and powertrains, when combined with its roomy interior and available signature Audi technologies, make it a small car with a disproportionate level of desirability.
A4
- The 2013 Audi A4
  Starting at $32,500*
  - View A4 Sedan Overview
  - Build Your Audi A4 Sedan
  Already renowned for its athletic driving character and spacious interior, the Audi A4 returns for 2013 with a fresh look, a revised interior, and a new electromechanical steering system for better agility and efficiency.
- Also Available
- S4 Sedan
A5
- The 2013 Audi A5 Coupe
  Starting at $37,850*
  - View A5 Coupe Overview
  - Build Your Audi A5 Coupe
  Performance against practicality has always been the discussion around coupes, but the 2013 Audi A5 Coupe harmoniously blends them together with brisk performance, all-weather traction, room for four, and a fuel-efficient* turbocharged engine. The result is perhaps the best answer yet to the great coupe debate.
- Also Available
- S5 Coupe
- A5 Cabriolet
- S5 Cabriolet
- RS 5 Coupe
- RS 5 Cabriolet
A6
- The 2013 Audi A6
  Starting at $42,200*
  - View A6 Sedan Overview
  - Build Your Audi A6 Sedan
  Given that the previous Audi A6 was still winning comparison tests in its final year, its replacement had big shoes to fill. Yet the new model has proven every bit as distinguished, drawing acclaim for its sensuous interior, gratifying driving experience, and efficient** drivetrains.
- Also Available
- S6 Sedan
A7
- The 2013 Audi A7
  Starting at $60,100*
  - View the A7 Overview
  - Build Your Audi A7
  Drivers who prefer their luxury with a dose of originality need look no further than the Audi A7. Combining strong, smooth performance and a wealth of space and amenities, it also features a body whose unique form and daring roofline make for a striking statement on the road.
- Also Available
- S7 Sedan
A8
- The 2013 Audi A8
  Starting at $72,200*
  - View A8 Overview
  - Build Your Audi A8
  The 2013 Audi A8 flagship represents progressive advances in engineering, technology, design and performance. The A8 has moved luxury forward, solidifying our commitment to excellence with a refusal to settle for anything less.
- Also Available
- S8 Sedan
allroad
- The New Audi allroad®
  Starting at $39,600*
  - View the Audi allroad® Overview
  - Build your Audi allroad®
  The Audi allroad® has the proven capability of Audi quattro® all-wheel drive, the cargo capacity of a crossover and the refinement of a luxury car. Together with its generous ground clearance and stainless steel underbody protection, the allroad® is at home on almost any terrain.
Q5
- The 2013 Audi Q5
  Starting at $35,900*
  - View Q5 Overview
  - Build Your Audi Q5
  Every so often a car is made that perfectly delivers upon the desires of the times. Right now that desire is the handling of a sport sedan, the higher ground clearance of an SUV, and the cabin of a luxury car - an apt description of the Audi Q5.
Q7
- The 2013 Audi Q7
  Starting at $46,800*
  - View Q7 Overview
  - Build Your Audi Q7
  The Audi Q7 is a capable sport-utility that happens to excel at transporting seven passengers in the lap of luxury. It offers a solid, substantial demeanor, the versatility of quattro® all-wheel drive, and the choice among two swift, supercharged gas engines and a turbocharged diesel V6 that can tow three tons.*
TT
- The 2013 Audi TT Coupe
  Starting at $38,650*
  - View the TT Coupe Overview
  - Build Your Audi TT Coupe
  A longtime design icon, the Audi TT Coupe has become renowned for its striking style and spirited performance. Coupled with its efficient nature, four-passenger capacity, and Audi quattro® all-wheel drive, one might say the TT pioneered the concept of an indulgence that can be enjoyed every day.**
- Also Available
- TT Roadster
- TTS Coupe
- TTS Roadster
- TT RS
R8
- The Audi R8
  R8 4.2 Starting at $114,900*
  - View R8 Overview
  A rare and exclusive supercar with high-design, captivating refinement and a heritage of racing dominance. With a mid-mounted V8 or V10 engine, quattro® all-wheel drive and, Audi Ultra® lightweight technology, the R8 Coupe offers handling and balance worthy of any racetrack.
- Also Available
- R8 Spyder
- R8 GT
- R8 GT Spyder
S
- The Audi S Models
  Enhanced Performance and Unrivaled Styling Define the S Models
  - View S4 Overview
  - View S4 Photos and Videos
  In the Audi S4, the S stands for both sport and style. Your eyes will be drawn to its handsomely sculpted body and throaty quad tailpipes, but the real magic lies underhood, where you'll find a supercharged V6 engine channeling 333 horsepower through a performance-oriented quattro® all-wheel drive system.
- Also Available
- TTS Coupe
- TTS Roadster
- S5 Coupe
- S5 Cabriolet
- S6 Sedan
- S8 Sedan
- S7 Sedan

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0-9

Aerodynamic Drag

Aerodynamic drag is the resistance (retarding effect) applied to a body as it passes through the air. It is made up of two components, caused by pressure and by friction. Resistance caused by pressure occurs because there is a difference in air pressure between the front and rear surfaces of the body. This has to be overcome to keep the body moving through the air, and is particularly significant in the case of relatively flat-surfaced, bulky objects such as motor vehicles. If the body moving through the air is slim and streamlined, however, like a modern aircraft, resistance due to friction represents a higher proportion of total aerodynamic drag. It is caused by the airflow rubbing against the surfaces as it passes over them.

Aerodynamic drag increases at the same rate as the square of the air speed. In other words if the speed doubles, the drag increases fourfold; if it quadruples, it increases sixteen-fold. See also: cd value.