I have used the same disc for 20+ years.  I have pulled it with a 4430,4460, 4475 and now the 8200. 

Last time I checked it, with one of the first 3 tractors, can't remember which one, I used about 1 gallon of fuel per acre.  I mean I filled the tank, disced the field.  Weighed the portable fuel tank, refilled the tractor as needed.  Re weighed the portable tank to get my 1 gallon per acre results. 

I have not gotten that far with testing this 8200, but what I have been doing by the seat of my pants oberavation it will be much more than 1 gallon per acre. 

Have others seen this? 

8200 has 4500 hrs.  Not sure if injectors have ever been changed. 

Just asking.