I used to fill up my diesel hatch with Unioil diesel Euro IV a few tank full. I used to get a total mileage of 700-750 km)/tank ( based on the computer). When I shifted fuel to Shell Fuel Save (after reading an Eco run article on Top Gear), my mileage gradually increased & currently runs 840 - 880 km/tank (again based on the computer). Power & response improved also. I think it had something to do with the sulfur content (150 vs 500 ppm). Articles did say that the lesser sulfur will affect the FC of your car.


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