This article details the fuel consumption data of the Audi A2 (Typ 8z series; first generation): 1999, 2000, 2001, 2002, 2003, 2004, 2005 model years.
| Engine | City | Combined | Highway |
| 1.4 TDI / 90 Hp (67 kW) | 42 mpg | 54 mpg | 67 mpg |
| 5.6 L/100 km | 4.4 L/100 km | 3.5 L/100 km | |
| 50 mpg (UK) | 65 mpg (UK) | 80 mpg (UK) | |
| 1.6 FSI | 29 mpg | 39 mpg | 50 mpg |
| 8.1 L/100 km | 6 L/100 km | 4.7 L/100 km | |
| 35 mpg (UK) | 47 mpg (UK) | 60 mpg (UK) | |
| 1.2 TDI Automatic | 65 mpg | 78 mpg | 87 mpg |
| 3.6 L/100 km | 3 L/100 km | 2.7 L/100 km | |
| 78 mpg (UK) | 94 mpg (UK) | 104 mpg (UK) | |
| 1.4i 16V | 29 mpg | 39 mpg | 51 mpg |
| 8.1 L/100 km | 6 L/100 km | 4.6 L/100 km | |
| 35 mpg (UK) | 47 mpg (UK) | 61 mpg (UK) | |
| 1.4 TDI / 75 Hp (56 kW) | 42 mpg | 54 mpg | 67 mpg |
| 5.6 L/100 km | 4.4 L/100 km | 3.5 L/100 km | |
| 50 mpg (UK) | 65 mpg (UK) | 80 mpg (UK) |
