By subframe are you talking about the suspension crossmember? That's easy to replace. 4 bolts hold it in place. One bolt for the steering shaft, 2 ball joint nuts.
The engine and transmisson bolt to the body not the subframe as mentioned earlier. Only one dogbone mount attaches to the subframe that stops the engine from rocking.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)