Real MPG: Smart Forfour (2014 - 2019)
Select engine for more Real MPG information:
| Engine | Official MPG (NEDC) | Official MPG (WLTP) | Real MPG Avg. | Real MPG % | |
| 0.9 | 52.3–65.7 mpg | 47.9 mpg | 48.6 mpg | 102%* | |
| 0.9 Automatic | 54.3–67.3 mpg | 47.9 mpg | 44.1 mpg | 92%* | |
| 1.0 71 | 54.3–67.3 mpg | 43.5 mpg | 48.0 mpg | 110%* | |
| 1.0 71 Automatic | 56.5–67.3 mpg | 43.5 mpg | 37.3 mpg | 86%* | 
Read the Honest John review...
Smart Forfour (2014 - 2019)
                Excellent turning circle. Easy to park thanks to compact size. Low emissions.
            
        Rivals
| Smart Forfour (2014 - 2019) | 46.5 | avg mpg | 
| Ford Focus (2014 - 2018) | 46.0 | avg mpg | 
| Ford Mondeo (2015 - 2021) | 46.0 | avg mpg | 
| Nissan Pulsar (2014 - 2018) | 49.9 | avg mpg | 
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