I just did a 2876km trip in Namibia. Had a grenadier trialmaster diesel. 4 adults, fully loaded with gear, and mostly on lowish (2-2.4bar), and for some parts ridiculously low tyre pressures (1 bar in the deepest sand). Mixture of high speed (70-80kph) dune driving (more like 40m height dune skidding and jumping at high speed), salt and gravel roads (between 80-140kph), deep corrugations (50-70kph), and highway driving (130-166kph). And a lot of climbing up and down gradients from sea level up to 1700m above sea level. All with a heavy right foot, and done with a DTE plug and play ECU power control module installed. Shout out to Ineos M&Z in Windhoek Namibia who made it all possible. My fuel economy for the whole trip averaged 13.6L/ 100km.
My grenadier Trialmaster diesel- at home in Australia isn’t chipped (yet), and our police won’t let me drive at 166kph, nor are Australian roads generally good enough to drive at high speed safely. I still have a lead foot though. Fuel consumption for me in Australia at highway speeds (80-100kph) is usually around 9.7L/100km or less. Average fuel economy for me in Australia which is a mixture of highway, city, and a little off road gravel is currently 11.7L/100km.
I think these are good numbers for the Grenadier, and better than I expected especially the Namibian trip fuel consumption. I have a BMW X6 which has the same diesel engine (ECU chipped too) and I get around 10.4L/100km driving that in a combined city/highway cycle with usually just 1-2 people in it.The Ineos for heavier weight, different engine and gearbox mapping, and usually with around 1000kg more weight is only using a fraction more fuel. I think that’s awesome and reflects how good Ineos have set the vehicle up.
Bottom line, I love my Grenadier, the best overlander I’ve driven in 20+ years and will not be changing it for anything else any time soon.