Thread: D4 fuel consumption seems excessive

Only an ECU reflash completely resets the trip meters and fuel use algorithm. I believe it can be altered/ adjusted but that means editing the vehicles config file.

Originally Posted by Eric SDV6SE

Only an ECU reflash completely resets the trip meters and fuel use algorithm. I believe it can be altered/ adjusted but that means editing the vehicles config file.

no , just press and hold the button

That just zeroes the trip meters, however to my understanding the car still remembers the "lifetime" average" and applies that to fuel usage calculated.
I zero trip A each time I fill and usually run on trip Auto to see how each drive is, then cycle through A and B to see usage for the tank and then long term use is B. I was on 9.6-9.8 for ages before my ECU was flashed, afterwards it went to 15l/100km. I rang Roo Systems about this and they told me what I just posted before. An ECU flash deletes all the long term fuel stored values and it starts again from scratch.

My indicated is now 9.8 - 10.0 and my calculated was around 10.3 to 10.6, I've since added a Rhino platform and awning and running AT tyres in lieu of HT, and it's sitting around 11.0 or so. I also rarely let the tank get below 1/4 empty on the weekly commute, so there's a bit of dead fuel weight there too.

All in all i don't really care about fuel usage unless i was planning a long remote trip and fuel stops. The car gets almost twice the mileage compared to anything else that's similar (which is what exactly?) and is a 100 times nicer to drive than most other cars.

Originally Posted by Eric SDV6SE

My indicated is now 9.8 - 10.0 and my calculated was around 10.3 to 10.6, I've since added a Rhino platform and awning and running AT tyres in lieu of HT, and it's sitting around 11.0 or so. I also rarely let the tank get below 1/4 empty on the weekly commute, so there's a bit of dead fuel weight there too.

That consumption is very similar to mine, although I’ve only calculated it over 10,500Km.

Mine is a TDV6 (155Kw/520Nm) 8-speed, Rhino Rack Platform, awning, Maxxis AT980, ARB Bullbar and winch.

To reset the long term average, have the average fuel consumption up on the display then press and hold the left button. From what I’ve seen, this is the ONLY way to reset the long term average consumption
I got this from reading the manual

Originally Posted by wardy1

To reset the long term average, have the average fuel consumption up on the display then press and hold the left button. From what I’ve seen, this is the ONLY way to reset the long term average consumption
I got this from reading the manual

thats what I always do Wardy. Still showing at least 2 litres per hundred over what’s it’s been doing since new. Weird.
One thing I am wondering, is it possible to recalibrate the fuel consumption readout using the GAP tool?

Originally Posted by GregMilner

thats what I always do Wardy. Still showing at least 2 litres per hundred over what’s it’s been doing since new. Weird.
One thing I am wondering, is it possible to recalibrate the fuel consumption readout using the GAP tool?

Yes

Greg

I had the same issue with my 2014 D4 about a year ago..

Then I noticed that one of the front hubs was hot ie likely the brake 'sticking on'

Took to Southern LR here in Perth who replaced the brake switch.. and sorted, fuel consumption back to 9 (as you say)