Thread: Fuel consumption test over 2,700km towing

I have been told you can adjust the odometer via the Gap tool, especially if you use tyres different in size from EOM. Before I had the Compomotives, my odometer was accurate (ie in line with Oziexplorer, but the speedo was about 6% over actual. With 265/65/18, my speedo is accurate but my Odometer is now 6% light. Ie when I have covered 100kms (actual) odometer only says 94kms. I am unsure if you can adjust both the speedo and the odometer to reflect the actual speed and distance together. I am sure it can be done, just wish in knew someone who could tell me. In any case as I live in the Nanny State, I worry more about not speeding than worrying about how many kms I have travelled.

Odometer and speedometer are separate parameters in the CCF. Whilst I don't know if the 16.5 D4's CCF is different to earlier D4s but I adjusted the speedometer parameters including cruise control parameters in my previous MY10 D4 to the other market specification that is only 2% optimistic rather than the standard 3kph+2%, which doesn't seem much but makes 100kph displayed for actual 98kph instead of actual 95kph.

Originally Posted by DiscoJeffster

This is not correct for a Discovery if the right sized wheels and tyres are fitted. The Discovery knows the exact distance it has traveled and uses that for the odometer. The speedometer is deliberately exaggerated by a percentage adjustable in software, but this has no bearing on the odometer. This is documented somewhere in the architecture but be buggered if I’m going to go and find it.

well ok, it says i average 8.5 l/100. long hauls maybe i will measure the fuel in, take note, if its true, my 4 must be the most frugal 4x on the road
thanks for input

Originally Posted by Pippin

So if you correct the speedo to read actual does that also correct the ODO reading?

no idea Pip

Originally Posted by stuarth44

well ok, it says i average 8.5 l/100. long hauls maybe i will measure the fuel in, take note, if its true, my 4 must be the most frugal 4x on the road
thanks for input

Fuel consumption is another calculation for which a correction factor can be adjusted in the CCF. LR has it set very optimistically when for average driving it needs to be considerably more pessimistic.

Originally Posted by GregMilner

Yes I'm aware of that, but it was a judgement call - I'd rather risk going a few kays above that than on or just below it and have triple trailer road trains overtaking me, which happened two or three times early on in the trip. And if we got up behind a road train, I sat behind it till one of us turned off or stopped for a break.

.. also keep in mind .. DOUBLE demerit points this weekend!