Thread: Can you "zero" the fuel consumption.

My speedo is incorrect, reads high as said above. I have not checked the accuracy of the odometer against a GPS though. I'm guessing it's not a given that becasue the speedo is wrong the odo is wrong.

As to the fuel average, mine is definitely bulldust compared to what I'm calculating based on the fuel I'm actually using measured at the bowser. It does indicate how you're going in the context of its own (faulty) algorithm though, and that's useful.

Originally Posted by JamesH

My speedo is incorrect, reads high as said above. I have not checked the accuracy of the odometer against a GPS though. I'm guessing it's not a given that becasue the speedo is wrong the odo is wrong.

Correct - different parameters are set in the CCF to set the accuracy of these independently.

Cheers,

Gordon

Originally Posted by JamesH

<snip> .... As to the fuel average, mine is definitely bulldust compared to what I'm calculating based on the fuel I'm actually using measured at the bowser. It does indicate how you're going in the context of its own (faulty) algorithm though, and that's useful.

I do watch the fuel economy and try to drive to achieve the best economy, even if it is innaccurate, but without the ability to clear the previous data it was a pointless exercise for the first few hundred Km.

When you check the odo you will find it will be almost spot on,as per ADR's.

The speedo has to read more than you are actually going,most modern vehicles are doing around 96 to 97k/hr when the speedo says 100k/hr.

As others have said it is nice to be able to see approx. fuel consumption.

But there are many other vehicles on the market that are VERY accurate,fuel consumption being the same as calculated.

You would think LR could sort it........

I don't know if the different tyres (General Grabber AT) will be a different rolling radius to the OEM fittings, but I suspect this is the reason for the difference of 6KPH for the speedo and makes for an error possibility in the ODO.

What I'm doing is leaving Trip A as a long term average fuel consumption figure and resetting Trip B at every fill up. You could also reset B when conditions change like hooking up a trailer, leaving the bitumen and changing the terrain control setting etc.

I enjoy tracking this stuff for its own sake as I'm an anorak/nerd by nature.

Just for fun when we were both going in convoy down to his farm about an hour south of Perth a mate and I both reset our trip meters, me in the D4 and him in a 2009 V8 diesel full sized Rangie. Traffic was smooth but busy and we spent a lot of time driving like nannas at about 80-90 kph. He got 9.3 l/100km, I got 7.9.

I just reset my "Trip B" after filling up and it definately reset the fuel consumption reading back to zero. First update was after about 1 kilometer and it obviously was not accumulating on the previous balance.
Regards
Barryp