I purchased my 2004 civic oil burner from my local Honda dealership back in November. I have all the usual after sales quality care you would expect from a used car from Honda. I have noticed that my car is only returning approx 350-400 miles per tank of diesel. I am taking my readings from light to light. i.e. from nearly empty when the little orange light comes on until the light comes on again after using the tank. I normally fill up with approx 41 litres of diesel. I,m not sure if the light is coming on too early or is it just normal consumption? I do a lot of short commuting journeys but even on long runs when the trip reads a steady 52mpg, the tank still only returns approx 383miles. I,m normally reading about 48mpg around town. I dont kane it everywhere and there are only 27000 miles on the clock. By my calculations its only returning approx 42mpg?