My Disco TD5 is chipped, runs bigger tyres, roof rack with pole carrier, hilift, and an awning, drawers, bullbar, aircon on all the time, I get between 10.5/100k to 12/100k around town/hwy depending on how heavy my right boot is, and around 13/100k to 15/100k towing the camper, worst has been 17/100k towing.
Your figures are not bad but yes I would think that getting 10/100k is not unreasonable if your Disco is stock, even 9/100k.
Baz.

