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Next time, fill the tank and zero the milecounter. Drive, then when you fill it up again make a note of the number of litres it takes to fill up and the number of miles done - then you can work out the MPG.
This is what Fuelly does. Text mileage, litres and price each time you fill up (to first pump click for consistency) and it will text you back previous mileage, cost per litre, overall mpg etc etc. It also tracks it online.... my current car: http://www.fuelly.com/car/bmw/430d/2015/soul7963/550815
Soul
christianSpaceman
Next time, fill the tank and zero the milecounter. Drive, then when you fill it up again make a note of the number of litres it takes to fill up and the number of miles done - then you can work out the MPG.
The fuel gauges are not very accurate.
Good luck doing the plugs :P