I think I remember reading about someone having a problem with the sending unit. I can't recall if it was leaking fuel or loose plug, it's easy to see though if you lift the rear seat bottom and remove the small plate under it. You should be able to tell if you have a leak there pretty quick. Have you checked your fuel pressure?
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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)