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Mulga Profile
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Date Registered: 02-2014
Location: Central Vic goldfields
TOTAL POSTS: 42
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Fuel consumption gauge?


Hi, did a search but couldn't find the answer I was looking for.
With the fuel consumption indicator, is it supposed to be accurate?
Iv tried resetting it each trip, iv tried leaving as it is and im constantly getting a reading of around or between 6 litres per 100 ks and 6.5 no matter what I do. But by my calculations there is no way im getting this. Im getting 900ks to the tank, which im not complaining about as I reckon that's good. But if I was getting what it shows id be getting better. By my estimate im getting an actual figure of around 7 to 7.3 or thereabouts. 95% of my driving is open road. Are they all like that?

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Jon X3558
2013 T31 Manual TS Diesel
15/May/2014, 4:39 pm Link to this post Send Email PM   Send Private Message Blog
 
DogTrail Profile
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Date Registered: 05-2012
Location: Sunshine Coast
TOTAL POSTS: 481
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Re: Fuel consumption gauge?


There will be differences as I run petrol and you run diesel, but over the last approximately 500 km the onboard computer tells me that I've averaged 8.3 L/100 Km.

Over its lifetime, the onboard computer has always over-estimated my fuel useage by up to 5% which is surprisingly similar to its inbuilt speed over-estimation.

On refuelling to the absolute brim of the fuel tank each time (third cutoff at the fuel hose after allowing everything to gurgle away down the fill pipe) , my real usage was 8.0 L/100km.

The onboard computer is apparently calculating usage from its fuel reading at the tank vs the km covered.

I suggest that the fuel reading by the tank gauge has a margin of error.

For me the error is less than 5%. Not enough for me to worry about.

To test yours, reset everything to zero & run a tankfull through.

Then compare the cars fuel consumption reading to the actual calculated fuel consumption after refuelling.

That will give your degree of error.

Last edited by DogTrail, 15/May/2014, 9:13 pm


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2011/12 Australia:- 2.5 litre petrol 4WD, Series IV ST, CVT : + some gadgets and cosmetic add-on's. Dirt, (it protects the paintwork) X-2429(c).
15/May/2014, 9:01 pm Link to this post Send Email PM   Send Private Message
 
Mulga Profile
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Date Registered: 02-2014
Location: Central Vic goldfields
TOTAL POSTS: 42
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Re:


Thanks mate. Yeah done that, mine is way out. To the point it is useless. Love to be getting the fuel economy its telling me I am by the gauge. The one where it shows how many ks travelled compared to whats left to go is not bad. But the usage per 100 is useless when im actually getting say 7.2 as an average and it tells me im getting around 6. Id think it was just a gimmick but some here seem to be, like yourself, actually getting at least near to what it reads. Maybe mines just one of those that was made with a bigger margin of error to the norm.

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Jon X3558
2013 T31 Manual TS Diesel
15/May/2014, 10:28 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 02-2014
Location: Central Vic goldfields
TOTAL POSTS: 42
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Re:


Did a quick calculation, out by 14%.

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Jon X3558
2013 T31 Manual TS Diesel
15/May/2014, 11:09 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 10-2011
Location: Darwin, NT
TOTAL POSTS: 325
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Re:


I don't think I've ever driven a car where the fuel consumption meter is 100% accurate. It's meant to provide a guide as to your fuel consumption, but I doubt that any car manufacturer intended for it to be completely accurate. Such a device, to be accurate, would need to be frequently re-calibrated.

I imagine that the type of diesel being used would also affect the accuracy.

My TL Diesel averages between 7.4-7.6 on the gauge. And based on some rough manual calculations based on refills at the station, it's fairly close.

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Mark T
2011 Series 4 T31 TL Auto - Twilight, factory towbar, factory mats, tinting, Cooper CS5s, cathodic protection, paint protection, yada yada...and no Provent
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16/May/2014, 12:16 am Link to this post Send Email PM   Send Private Message Blog
 
Mulga Profile
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Date Registered: 02-2014
Location: Central Vic goldfields
TOTAL POSTS: 42
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Re:


Hi Mark. I didn't expect it to be 100%, and im not spewing or anything, but thought it would be close.
I only use Caltex Vortex, like everything else iv owned since the Vortex came out. Iv never seen mine in the 7 range other than when its first reset and it runs down from the high numbers for about the first ten minutes of driving then it goes down into the low 6's to 6. It passes 7, doesn't stay there for very long. Now and then it actually shows around 5.8. Now that'd be great if in real terms if I got that! I probably wont bother to look at it much now other than to see if it for some reason changes or to use the bar graph as a kind of "keep it in the economy range" perhaps now and then. But as it is the way it reads its of little use to me. No drama, im getting good economy as it is.

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Jon X3558
2013 T31 Manual TS Diesel
16/May/2014, 2:39 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 05-2014
Location: Riverina, NSW
TOTAL POSTS: 46
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Re: Fuel consumption gauge?


quote:

Mulga wrote:

..Im getting 900ks to the tank, which im not complaining about as I reckon that's good.



What do you call a tank, is it the full 65l, 60l or 55l? It makes a big difference when working out economy. It is no good just stating that you get so many klms to a tank, as a "tank" can vary so much.

Ecstrail



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2013 runout TL, Diesel with manual gearbox
2/Jun/2014, 7:31 am Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 02-2014
Location: Central Vic goldfields
TOTAL POSTS: 42
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Re:


Hi mate. I call a tank this. I have travelled 800 ks and im getting low but the gauge shows some left, I fill up and take note of how much it took to fill then gauge how much would have been left. I wouldnt run that low all the time but have done so twice so as to get a good idea of how many ks im getting. Simple! Im for sure getting what I stated, 900ks. I live in the bush and after only ten or so gear changes im off and cruising, now and then a bit of shopping in town but most of my driving is open road to get to somewhere many ks away, a bit here and there in the bush when I go fishing or detecting on my days off . So yeah, 900ks to a full tank no problems. I drive it the way it likes to be driven, keep the revs around the 2000 mark or over when cruising, gear change around 2500 rpm now and then a bit higher 3000, give it a squirt now and then for good measure, a push or two uphill. It hates to be driven like a slug, but I don't cane it either, try to keep it in the happy zone all the time and im getting very impressive economy as far as Im concerned. I guess though those who drive a bit through towns and cities all the time, stop starting don't get anywhere near what I do and that I would expect. To me this is a great car for those who live in the bush like me and do plenty of open road driving, but given the way it likes to be driven and how it just laps up the open road driving and drinks so little when doing so its not one that I would personally recommend for city livers, stop starters, low speeds, who cannot because of their environment drive it as it likes.

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Jon X3558
2013 T31 Manual TS Diesel
12/Jun/2014, 12:54 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 05-2012
Location: Sunshine Coast
TOTAL POSTS: 481
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Re: Re:


Gibberish.

Last edited by DogTrail, 23/Jun/2014, 9:24 pm


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2011/12 Australia:- 2.5 litre petrol 4WD, Series IV ST, CVT : + some gadgets and cosmetic add-on's. Dirt, (it protects the paintwork) X-2429(c).
23/Jun/2014, 9:11 pm Link to this post Send Email PM   Send Private Message
 
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Date Registered: 02-2014
Location: Central Vic goldfields
TOTAL POSTS: 42
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Re:


How so?

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Jon X3558
2013 T31 Manual TS Diesel
23/Jun/2014, 10:23 pm Link to this post Send Email PM   Send Private Message Blog
 


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