Now, I don't know your driving style, but I suggest you try driving techniques that maximize fuel economy for at least one tank. The Mirage will definitely reward your efforts here!
Originally Posted by Ranny
To help with this, consider getting some means to monitor your instant fuel economy from your OBDII port. Many here use something like ScanGauge, but I got a bluetooth adapter and use an app on my smart phone to get more info, including logging. Though cheap ELM327 OBDII adapters are available, I paid for better quality with faster response and more features, and it cost one third what the ScanGauge goes for. Knowing instant fuel economy can give helpful feedback to train your driving style to reduce fuel consumption.
View my fuel log 2015 Mirage ES 1.2 manual: 48.7 mpg (US) ... 20.7 km/L ... 4.8 L/100 km ... 58.5 mpg (Imp)