Calculate your MPG

The best way to calculate your MPG is to zero your trip meter when you fill your car, fill until the petrol pump clicks and then when you refill, record the mileage driven from the trip meter, the liters used and cost from the fuel pump, and use those figures to caluculate your true fuel economy. Do this every time you fill up and you will have a true idea of the economy of your car and if its changing over time, a potential warning sign of engine health issues.