It is also currently showing 45.1mpg. Is this good for a car of its size?
My wife's 2000 Clio 1.4 would get about 50mpg on long journeys, so your figure of 45 is quite reasonable for a 1.2.
A car's trip computer can be fairly accurate, but your own calculation is the only way to be certain, as the car can only guesstimate how many litres you put in. I believe it calculates by metering the fuel through the injectors.
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