Even if it needs engine mounts. Big deal, they're easy to change and could probably just get some used ones for cheap. But like I said, I've never needed to replace one in these cars yet. I've changed a bunch in our Sonics around 200k kms. They would vibrate the car pretty bad while in drive.
What kind of noise while accelerating? Mounts cause vibration. If it changes depending on speed I'd be looking at wheel bearings or worst case cvt. Find out if it varies by speed or load?
Mirage videos:
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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)