I haven't seen 40mpg in mine. I'm running slightly taller winter tires, burning crappy winter fuel, driving in snow, cold etc. I swear my fuel gauge drops faster when I carry some tools around. The best I've gotten was 38mpg twice. On the freeway I drive everyday the limit is 50mph/80km, I usually do 55mph/90-95km and just keep up with traffic because racecar. Rpm will usually drop to around 2000 or less at those speeds. I don't bag the crap out of mine but don't drive slow enough to piss off everyone around me either, I'm happy enough with the mileage I'm getting but would be nice to get a bit better. Will see how that goes once winter f's off.
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)