We are a 2 car family, one owned, one a fleet car. Sad I know, but I watch the fuel consumption of both cars. Recently, I filled up the Honda with a tank of diesel at a local supemarket. I calculated that the fuel consumption had dropped about 10%. I put this down to a few short trips recently. When I took the other car, a new diesel Peugoet 308, to the same garage, and filled up, this car also seemed to have seen a similar drop.
Having had consistent consumption over the last three months, I checked my figures and found no error. I would have to be way out on mileage or fuel used to get such a large discrepancy.
It struck me as strange that this would happen on two cars almost simultaeously. My question is, would moving to the supermarket fuel affect fuel consumption? Is there really that bigger difference in quality of fuel which would impact fuel consumption in this way?
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