Those consumption figures seem within the range. Also depends on the length of the trip, weight carried etc. Weight (bull bars/sump guards/winches) is a significant issue. It's one of the reasons car makers are ditching a full size spare in favour of a spraycan... in some vehicles, the weight of as full size spare can add 0.3L/100km. Aircon on a hot day is worth about 0.5-0.7L/100km. Once you get over 110kmh indeed over 80kmh, the drag coefficient rears its ugly head... double the speed, four times the drag... so the drag at 120kmh is X4 the drag at 60kmh...
AT/MT tyres also chew more energy than H/T tyres and can marginally increase fuel consumption...
Have you tried resetting the Adaptive Values for the EFI system? If you have a Faultmate/Nanocom it's an easy task. Sometimes it assists in reducing fuel consumption.
MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
2020 Subaru Impreza S ('SWMBO's Express' )
2023 Ineos Grenadier Trialmaster (diesel)
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