I appreciate the average MPG dash readout is optimistic for almost every car out there, my car generally reads 2 to 3 MPG higher than the actual calculations. But I fuelled up a day or two ago and there was an almost 5 MPG difference. I checked all my figures and everything is correct, but I've never had such a big discrepancy like that. Any ideas why this is? Could the fuel pump have been over reading slightly? Any other ideas or suggestions?
Draigflag 
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