Yeah - don't get too excited about the recently reset readings from the "A" gauge over s ahort distance, whether high or low. The highs & lows will average out over the course of a tank.
But those numbers for the G4 are within the realm of possibility under ideal conditions:
Thread: Darin's test drive review notes: 2017 Mitsubishi Mirage G4 sedan CVT
View my fuel log 2014 Mirage base ES 1.2 manual: 54.0 mpg (US) ... 23.0 km/L ... 4.4 L/100 km ... 64.9 mpg (Imp)