400km on 55l of fuel is pretty low. A car that gets 50mpg (UK gallons), which is fairly middle of the road efficiency, would go 600 miles, or 965km on that, assuming motorway driving.
I regularly do 550 miles (850km - 5 return trips of 55 miles each way) on a single 60l tank of diesel in an older car and can do more if I dawdle and cruise more. I know I've been driving badly when the fuel light comes on on before the end of the fifth trip.
I regularly do 550 miles (850km - 5 return trips of 55 miles each way) on a single 60l tank of diesel in an older car and can do more if I dawdle and cruise more. I know I've been driving badly when the fuel light comes on on before the end of the fifth trip.