economy

Your fuel usage does seem high. I have an 80 series standard diesel and do about 400km's to work and back mostly highway on 100kph. A few hills and gear changes. I consistently get 11L/100km or less. Even if I include a few trails on our property with steep climbs there is no way I would use 15L's, though I have no a/c and maybe 110kph would make a difference.

Cmon.....u guys, haven't you heard...you won't learn will you?????? Where's your fitch and you will halve your fuel consuption, triple your oil change intervals, never need to put air in your tyres, check the fluid levels under the hood, replenish the beer fridge (ok I was joking about that one hehe).....oh I could go on and on and on......

Leroy

PS. GU 3.0l - 12-13l/100ks most of the time. Don't know how people get to 10's

Hi Andrew - those figures are similar to what I get out of my 2.8tdi GU when towing my Kanga Camper at 110kmp with aircon on - on the highway. It goes up to about 17l/100km when in the sand tracks like in Big and Little Deserts. Highway running at similar speeds is around 11.5l/100km. I now have 181000km on the clock and over that distance I have averaged 12.33lt/100km,which from my viewpoint is pretty damn good for a 3tonne truck.

Cheers
Pete

Grand Cherokee CRD

Highway, A/C - 8.0L/100km

Offroad, Low Range - Trails: 10.0L/100, Sand: 12.5L/100km (Stockton)

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GQ TD42T

Highway, A/C - 11.0L/100km

Offroad, Low Range - Trails: 15.0L/100, Sand: 18-20L/100km (Stockton)

I get 12.5 around town and exactly the same at 100kmh in 5th gear....
I m carrying a fair bit of weight...(see rig details)....

'94 80 Series 4.5i Petrol 1FZ-FE

Varies between 17L/100k's heavy trails and hills to 13.5L/100k's highway speed between 90-100km and no A/C.

Scoey

Bombsquad

When I was living in the inland Pilbara (similar climate to the Kimberley minus the humidity) in my 3.0L Patrol lots of hwy travelling at up to 120 km/h, fuel consumption use to sit around 12.5 - 13 L/100km. Unless your speed goes up and down like a yo-yo I don't see how cruise control would make that bigger difference, the driveline losses through inertia (resistance to speeding up & slowing down of the driveline) makes up a very small amount, at hwy speed air-drag is the biggest factor, do you have a large roofrack on your vehicle?

Snowy

11L/100 around town
10L/100 highway
13L/100 sand

My 105 Series is generally around the 10-11L/100km mark for both tanks full to empty. This is a combination of regular short trips, with a few longer runs (40km+) thrown in. It actually works out well for our situation, as I get paid monthly, and a fill lasts a tad less than one month. We find ourselves walking round a bit, or not going out for the last few days......

If I sit on 110 on the freeway, it gets up to about 13 or so, but if I'm doing 110, it kinda goes between 105 and 120....;-). Sand calculations always scare me, but I would guess 13-14?

My best result ever was a trip from Parramatta to Jenolan, 4WD'ing for a few hours, then home again. It was exact to the cent 10L/100km.

Worst was probably a trip from the airport to Parramatta with a load of winches. The car was probably around the 3.2t mark, with a 3.5t (exactly) trailer on the back. I rekon over quarter of the main tank for a 30km run.

Not bad for a truck just shy of 3 tonnes when half loaded.

Cheers,

Chump

Thanks to all who have replied so far. my roofrack is just 3 rola bars, so shouldn't add a great deal. The engine had a rebuild 10000km ago, with about $600 dollars spent on the injector pump at the time. I submitted this post to see if it was comprable to others, and it does seem about 10% higher than it should be. New (std) air cleaners doesn't make any difference. Any suggestions welcome, especially from people with experience with this model and engine.

Trade up to a newie to get more power etc will cost me in excess of 35,000 + accessories, so this isnt realistic for basically the same body, chasis etc. Considering the gas injection option in the near future, to be followed at a later date maybe with either a 4.2 or chev 6.5 transplant.

Cheers Andrew

I have TD5 Disco, i filled up 6mths ago and haven't as yet used a full tank so i'll let you know soon as i fill up again.

Hey just as believable as some of the figures above.

Baz ;-)))

1996 Defender 110, 2.5 litre diesel

10 litres /100 km at 90 to 100 km/h
increases when we go over 105 km/h consistently.

Fitted cruise control recently and it does seem to have made a difference, but not quantified. The biggest difference we found with cruise control is that the accelaror ssems to go further than we can physically push the pedal with foot. That should not be possible. But the beast will easily cruise about 5 to 10 km/hour more than by using foot on pedal.

99 SE Jackaroo 3.0 TD - always have Campomatic Trailer in tow on bush trips.
Sealed highway @95kph=13 L/ 100k - at most (12L with tail wind).
Gravel roads add .5L at most (we would slow to 80k probably).
Slow going on rougher tracks etc add 2L to sealed, but probably less.
Yours is an "earlier generation TD" if I recall correctly - the next generation (common rail - 3L units etc.) would be more economic overall, but then they all cost to buy. The very latest generation (such as the Merc in the Jeep) are incredibly powerful, frugal and low on emissions, but cost heaps - fault diagnosis and the cost of repairs would be a nightmare on trips in my view - comparing your unit with the others, who is best off ?

Bombsquad

It might pay to check your air cleaner I used have a 2.8 with a finer filter in it & I went back to the STD paper units, as the others played havoc with the air flow meter & reduced the fuel economy

Cheers Steve

Andrew,

Troopie on steroids and 285/75/16 tyres 15l/100km.

Wayne

2005 Holden crewman crosstrack 6. Reset the trip meter/lites/k average. From standing start and floor it to about 120clicks, ave use comes up at 46 litres/ 100k's. When driving highway cycle about 11.8litres/100k's If I just kept on flooring it, I'd just get over 100k's per tankfull. LOL

Realistic figures
2005 Prado td auto with roof rack.
My figures over 14 000 km 17.1 litres per 100 km.
Took it into toyota and they plugged their computer in and reckon its getting
12.4 litres per 100 km.
I can't work it out.
120s cruiser

2000 model 4.5 Tojo Petrol/autogas - 100 series. Running on autogas and towing a 3.5 tonne caravan at 85kph average 31 - 37L/100K ..... but that gas is only 55 c/l

Not towing - runs on the smell of a gassy rag, or less if you fart frequently!

Have a good Chrissie et al.

Hi Bomber,

15/100 does seem pretty thirsty. We managed to still average just over 14/100 with a 2200kg 'van in tow, from Mt Isa to Broome and return, in Oct & Nov. That's with a '97 Discovery 300Tdi (2.5L Tdi), in high ambients (45C several days) and some b*gg*ers of head winds.

You say your engine was rebuilt 10,000 km ago and money spent on the injection pump. Unfortunately, this doesn't guarantee everything is correct. First thing I'd check is the injection timing. If it's out, it can have a major effect on power and economy.

Next, a couple of other things to look at: Have a close look at all air hoses/ducts - air filter inlet (snorkel??), air filter to turbo, turbo to intercooler, intercooler to manifold - are all the connections tight. Check the suction ones to see if they may be collapsing under heavy load and the pressure ones to see if perhaps they are de-laminating inside and becoming restricted. Is the intercooler clean, inside and out? Crawl underneath and check for damage to the exhaust - i.e. not squashed or kinked anywhere? Any of these things will restrict the 'breathing' of the engine, causing it to use more fuel (and, incidentlly, run at much higher than normal EGTs).

Also, was your pump calibrated to factory specs or 'tuned' a bit to improve low rpm performance? If 'tuned', it may be overfuelling in some parts of the rpm range. See if you can find an observer and a good 'test hill' - somewhere you can maintain full throttle in 4th or 5th from around 1500 rpm to 3000-3500 rpm. Have your observer look for black smoke as the revs increase - and note at what rpm it gets smoky - if at all (& if you have a boost gauge, note the boost pressure at which it is smoky - if at all). If you judge it to be too smoky at any point, perhaps take it back to your engine rebuilder/diesel specialist and ask for the fuelling to be adjusted in the appropriate range.

Hope this helps. Happy Christmas to all.
Ian

Firstly, have you cleaned the mass air flow sensor ?
Do you have a snorkel and sock or any other typre of air flow restrictions ?
Oversize tyres and weight kill good fuel consumption.

An example. I and a group of friends travelled the Simpson in July this year.
3 of us had the same vehicle, LR discovery Tdi's.

Stock standard disco on standard road tyres - 9L/100
(This car went from Coober Pedy to the last dune before Big Red on 82 litres)

Disco on oversize tyres - 11L/100

Disco on oversize tyres + roofbars with spare tyre - 12L/100

Hope you find a solution

John D

I only have 18K~ on my TD 3.0L Rodeo, and it is relatively stock - apart from TJM front/rear bars, 240XGT's, Rhino racks etc, weighed in around 1980Kg's + fuel, people etc

I have pasted the last few lines of my logbook and economy is around 9.4/5 L/100km so I would guess most of these figures are reasonably accurate

fill up 13 July 05 - 660km - 62.4L - 9.35L/100Km

fill up 29 July 05 - 620km - 57.5L - 9.27L/100Km

fill up 06 Aug 05 - 628km - 59L - 9.39L/100Km

fill up 14 Aug 05 - 537km - 49.8L - 9.27L/100Km

fill up 25 Aug 05 - 736km - 67.6L - 9.18L/100Km

fill up 28 Sep 05 - 757km - 71.4L - 9.43L/100Km

fill up 10 Oct 05 - 637Km - 59.7L - 9.37L/100Km

Fill up 28 Oct 05 - 794Km - 74.5L - 9.38L/100Km

Fill up 04 Dec 05 - 658Km - 62.2L - 9.45L/100Km

PS to those people who have emailed me re Kipor gennys - I haven't forgotten about you - its just that things take time to organise stuff from over there
cheers

John

95 TDi Disco. 205 tyres, snorkel, 120 litre fuel tank. 270 000kms

I have logged the fuel for the last 2 two and a bit years or 26957km (yeah, the car does not get driven much!)

Long term average: 9.93l/100km 99% Sydney urban/city driving, occasional country drive.
Weekly/monthly average goes up and down but that is due to variations in the amount of fuel left in the tank, and how much is put in at refill time... Country drives do not seem to improve fuel economy even though I cruise at around 95km/h.

1999 110 Defender xTreme - td5.

Best 8.5/100
worst 12/100

However consistently averages a spot over 10/100.

Does not like going above 110 - as it gets more thirsty.

OMG is all I can say, this Challenger of mine seems a bit thirsty. I changed the air cleaner element and it didn't make any difference.
Its a 3L V6 (manufactured Sept '99, though was sold to me as a 2000 model)
Its done just over 110,000 kms.
Over the last 30 tanks of fuel its averaged 12.9L/100kms that includes off road/city/everything. Never towing anything, only two empty rola racks on the roof, I never put anything on them.

Its going on gas in the new year anyway, but these vehicles are supposed to get around 11L/100 and lower.

What should I have a look at so see if it can be improved?

(hope this isn't hijacking your thread Andrew)
Cheers!

Hi Guys,
'99 Triton Duel Cab 2.8l NO turbo
about 9.5l/100km around town, or on the highway.
12l/100km on sand or towing on the road
13.5l/100km towing on sand.
Figures for towing are with a full tray(approx 700kg) and 900kg camper.
Air-conditioner doesn't seem to make much difference, but geez it slows me down.
It is a diesel, and i do baby it a bit, cause it is slow and just chugs away i don't push it to hard.
Greg.

Are you running on big flat tyres with a bull bar driving lights and a half dozen antenna hanging off your truck? Do you have the high lift suspension to make sure the maximum amount of airflow is directed under the vehicle?
Travelling at 110 km/h, does that mean you frequently have to slow then accelerate past your slower 4WD driving mates who are travelling between 85 and 95 km/h holding up all the road freight?

I slightly changed the way I drive around town and was rewarded by a 2L/100km improvement in fuel consumption and I didn't slow down I just concentrate on reading the traffic, lift my right foot early and avoid the brake pedal.

Oh and you wouldn't believe where I’ve been in my 2WD Toyota wagon (7.7l/100km average)