1. Suzuki Celerio 1.0
Official mpg 65.7 True MPG 57.8 % difference 12%
Despite being one of the cheapest new cars around, the Celerio comes with a decent array of equipment, including air conditioning, a DAB radio and Bluetooth connectivity. We also like the Celerio's 1.0-litre petrol engine, which is handy because it's the only option available. It recorded a True MPG of 57.8mpg, making the Celerio the most efficient city car we've ever tested.
The least efficient small car
Mini Cooper 1.5 3dr
Official mpg: 60.1 True MPG 41.3 % difference 31.3%
Stylish though it may be, this three-door version of the Mini hatchback is the least efficient small car we've put through True MPG. Although, truth be told, it's still not far off our top 10 entrants.
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