Real MPG: Subaru Impreza WRX STI (2008 - 2013) 2.5 WRX STI 330S
                
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                                23.7
                            
                            Official MPG(NEDC)
21.0–29.7                            
                            Real MPG
                        
                                24.5
                            
                            Real MPGAverage
                                    103%
                                
                                of Official MPG(NEDC)
More engines available for this model:
| Engine | Official MPG (NEDC) | Official MPG (WLTP) | Real MPG Avg. | Real MPG % | |
| 2.5 WRX STI | 27.4 mpg | - | 26.9 mpg | 98% | |
| WRX STI Hatchback | 26.9 mpg | - | 25.6 mpg | 95% | |
| WRX STI Saloon | 26.9 mpg | - | 27.6 mpg | 103% | 
Rivals
| Subaru Impreza WRX STI (2008 - 2013) | 26.3 | avg mpg | 
| Abarth 595 (2008 - 2025) | 38.4 | avg mpg | 
| Honda Civic Type R (2007 - 2012) | 31.0 | avg mpg | 
| Ford Focus RS (2009 - 2011) | 26.0 | avg mpg | 
