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You cannot rely on your fuel gauge or tripmeter to indicate your average mpg. You probably have a reserve of 4/5 litres which is included in the tank capacity.
If this were my car I wanted to measure the average MPG I would do the following
1. make sure the handbrake is not sticking on and does fully release, a sticking handbrake or brake pad will drastically increase your fuel consumption.
2.check your tyre pressures ( when cold) before the sun gets on the tyres
3.Fill the fuel tank to the brim ( I usually slow down the fuel through the pump filler so it clicks off with minimal splash back) then add about one quarter of a litre.Then you know the tank is more or less 100% full
4.Immediately reset the tripmeter to ZERO.
5. Now drive the car normally until the fuel gauge indicates that you have about one quarter of a tank left ( or you have travelled at least 150 miles).
6.Re- Fuel the car taking care to fill the tank completely + a quarter of a litre after the first click of the filler. Your fuel reciept should include the exact amount fuel (in litres) added. Make sure you note this figure anyway.
7.Read your trip meter and note the distance travelled.
8. Now you have the fuel used and the distance travelled, it is easy to calculate the MPG, this is the ONLY way to do it accurately.
note convert litres to gallons by dividing the litres by 4.546 eg 25 litres = 5.49 gallons.
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