So far we've had 2 members (that I remember) who have said the factory average fuel consumption gauge is reading pessimistic:
Polkiuj...
From: Speed vs. mileage/fuel economy chart - Mirage 1.2L 5-spd
CLARK ...
From: First impressions (Mirage GLS CVT)
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Has anyone else been comparing their gauge to actual calculations of fuel volume at the gas pump vs. distance?
I think it would be unusual for the gauge to be pessimistic - usually people who check these things complain their cars' fuel economy gauges tell a story that's too good to be true.