Question: what are the best mpg used cars?
Answer: Ford Fiesta 1.0 EcoBoost (Official fuel economy - 65.7mpg) ... 
Toyota Yaris 1.0 VVT-i (Official fuel economy - 65.7mpg) ... 
Vauxhall Astra 1.0T 12V ecoFLEX (Official fuel economy - 62.8mpg) ... 
Nissan Micra 0.9 IG-T (Official fuel economy - 64.2mpg) ... 
Mazda2 1.5 (Official fuel economy - 60.1mpg)