According to the US ratings, the Mirage is also a compact, while the Fiesta is a subcompact. This is based on total interior passenger and cargo space (103 vs 100 cubic feet for the respective hatchbacks). Also of note is that the best efficiency numbers are in the manual transmission on the Ford, but the CVT for the Mirage (manual Mirage=manual Fiesta in combined mpg). Mirage is still the overall winner with a combined 40mpg, compared to the combined 37 of the Ford.
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View my fuel log 2014 Mirage SE 1.2 manual: 45.0 mpg (US) ... 19.1 km/L ... 5.2 L/100 km ... 54.1 mpg (Imp)