First tank ended up netting me 4.5 L/100km (52.8 MPG). The MID B average was 4.9 L/100km before I reset it, but that would have included 30 km before I got it plus whatever idling the dealership did. The dealership filled the tank when I purchased the car.
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On a different note, I'm not very impressed with the highway fuel economy when travelling above 100 kph (62 mph). I took my Mirage up Island to go Snowboarding over the weekend.
The speed limit for the first 140 km (87 mi) was 80-90 kph (50-56 mph) and I was able to keep it around 4.2 L/100km 56 (mpg). After that the speed limit increases to 120 kph (75 mph) - the fastest in Canada, for the next 65 km (40 mi).
I attempted to go 120 kph (75 mph), but my mileage quickly started climbing, so I kept it around 100 kph (62 mph) - 20 kph below the speed limit. It still ended up climbing to 4.5 L/100km (52 mpg) by the time I got to my destination. Without a Scangauge I don't know what the fuel rate was when travelling at 120 kph, but I'm guessing between 5 & 6 L/100km (39 to 47 mpg).
Unlike most gasoline only cars it seems that the Mirage has better fuel economy in the city (like a Hybrid).
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View my fuel log 2015 Mirage SE 1.2 manual: 53.4 mpg (US) ... 22.7 km/L ... 4.4 L/100 km ... 64.1 mpg (Imp)