Every 2015 Audi A3 comes standard with a six-speed automated manual transmission and provides a choice of turbocharged four-cylinder engines named 1.8 TFSI or 2.0 TFSI. The A3 sedan gets a third engine option known as the 2.0 TDI. The numbers indicate engine displacement; the letters indicate whether it's powered by gasoline or diesel.
The front-wheel-drive A3 1.8 TFSI produces 170 horsepower and 200 pound-feet of torque. Audi estimates that it'll go from zero to 60 mph in 7.2 seconds. The EPA estimates for the A3 start with the 1.8 TFSI sedan that will return 27 mpg combined (23 city/33 highway), while the 1.8-equipped convertible will get 28 mpg combined (24/35).