We did the experiment with my 110 TD5.... 72L to the full top......11L when ambar ligth came in.... both with a Britpart pump..... Don't know if the ambar come later with the VDO I have now. I use to get 600-650 km in a full tank before ambar light (now with air conditioner all the time I feel lucky if can get 560 KM). My car always gave an excelent consumption until the government made a law about sulphur in the diesel. The new diesel is better, but it trashes my consumption, it passed from 40kpg as an average to 32kpg. I had to change my ECU map to improve it. Right now I'm in the 36 kpg with A/C, a great improvement

