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Welcome.
Mend the car. Put 3 bar in the tires. Get an OBD2 tool like ScanGauge or UltraGauge if your car has an OBD2 port (post '96?). Keep the speed below 100 km/h.
Have to say that 50 mpg seems quite a challlenge with such a relatively short commute. I can hardly maintain that with my Insight under winter conditions, and my commute distance is double yours.
When it is freezing I lose more than a quarter liter compared to my average consumption just to heat up the car during the first 10 kilometer, after that economy is hardly worse than during summer.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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