Fuel Consumption Rates

BUSHNUT

Well-Known Member
FUEL CONSUMPTION RATES

LITRES PER 100 km FOR FULLY LOADED VEHICLE

ENGINE SIZE HIGHWAY
Diesel 4 cylinder 10
Diesel 6 cylinder 14
Turbo Diesel 4 cylinder 10
Turbo Diesel 6 cylinder 12
Petrol 4 cylinder 9
Petrol 6 cylinder 16
Petrol 8 cylinder 14

ENGINE SIZE ALPS
Diesel 4 cylinder 19
Diesel 6 cylinder 23
Turbo Diesel 4 cylinder 18
Turbo Diesel 6 cylinder 22
Petrol 4 cylinder 28
Petrol 6 cylinder 35
Petrol 8 cylinder 34

ENGINE SIZE DESERT
Diesel 4 cylinder 19.5
Diesel 6 cylinder 23
Turbo Diesel 4 cylinder 18.5
Turbo Diesel 6 cylinder 17.5
Petrol 4 cylinder 29
Petrol 6 cylinder 34.5
Petrol 8 cylinder 33
 
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Sons of Callum

New Member
we have a Turbo Diesel 4 cylinder and on the highway we get about 11.5 to 12 litres per 100km. It seems to struggle at 110km/h. Dunno if anyone else with the same engine size has that problem?
 

cptmud

New Member
havnt done any rates on petrol, but on gas , my 4.5 cruiser gets 30l/100km, seems to be excessive, but only went skyhigh when i lifted it, bigger tyres and bar/winch.
 
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suttoh

New Member
hi, my nissan navara 08 turbo 2.5 is getting about 9.5l/100km pretty good, has winch bullbar and been lifted so im pretty happy, update!!! after i put the canopy on my econ rate went to 10.5 so there you go,
 
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millsy

4x4 Earth Contributer
Speed makes a big difference. My 1982 MQ Patrol, 2.8 litre SWB, on LPG gets around 12.5 litre/100km at about 80km/hr on the highway, now that it is tuned correctly.

This goes up to about 14 litre/100km at 90 km/hr, and drops to about 11 litre/100 km at 70km/hr.

Its all about air resistance, or drag forces, that make the engine work a lot harder at higher speeds.
The air resistance force depends on the square of the speed.

So to compare the relative sizes of air resistance drag forces at two different speeds you can use a calculator to do these types of calculations;

e.g. Compare the air resistance at 90km/hr to when driving at 80km/hr . . .

The ratio of these forces is the same ratio as ( 90 x 90 ) / ( 80 x 80 ) = 8100 / 6400 = 1.27

So a 12.5% increase in speed results in a 27% increase in air resistance forces.

But since the overall effort exerted by the motor includes a lot of 'internal' resistance through the gear boxes and the engine itself, that do not increase with the square of the speed, the fuel consumption does not suffer as greatly as does the increase in the air resistance force.

An interesting comparison is between 90km/hr and 100 km/hr, which is about an 11% increase in speed. If you did not realize that air resistance 'goes up' with the square of the speed, you would think that this would produce a similar 11% increase in air resistance. But it is quite a lot more;

( 100 x 100 ) / ( 90 x 90 ) = 10000 / 8100 = 1.235 which is a 23.5% increase!


I paid the $30 fee for a gas tune-up just before heading off on the trip to Geelong. It made a big difference! I used to get only 14 litre/100 km at 80 km/hr, but the tune-up lowered it to about 12.5 litr/100km. My ‘fiddlings’ with the adjusting screws over the last 12 months had produced a rich fuel/air ratio.

Now if I can get the other problems sorted out, and get back to running on 20/50 oil instead of 30/70, the economy should improve again with a bit of luck.
 
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creation4x4

New Member
Gday guys my gq 4.2 petrol averages 21L per 100 running around and it is weighing in at 2.6 ton at the moment the gas man i use has tunned it beatifully an the electronic ignition i put in it made a huge diffrence
 

LowLux

Moderator
Those are pretty accurate quotes. My 4 cylinder diesel Lux gets about 10lt - 10.5lt/100k's. Interesting to know tha tfigures for the Alps and desert as well.
 

babyface

New Member
My 08 Patrol 3lt td manual gets around 12.2 to 12.7 lt per 100k. That is driving mostly hwy sitting on 100km i have never got under 12, if i push to 110km i get 13.5 to 14lt per 100k. This is with out my roof rack on, if i leave it on it goes up to around 14.5.
 
we get aroung 600k or more out of the main tank on unleaded in the cruiser and half that for the reserve as its half the main tank this is on longer trips abit less roung city witch we try to avoid
 

croozza

Active Member
In my 3.4 ltr V6 prado I get a constant 12 ltrs / 100km, combo (highway/city) the vehicle has all the options on it too, leather, sun roof, elec seats, ect, and fitted with bull bar, big lights, bigger tyres, F&R lockers, too much to mention, so if I was to just to do highway it will be around 10-11 ltrs.
 

new24wd

New Member
My 2.8 TD gets bettween 10.2 per 100 and 10.8 regardless of around town or the hwy towing with a tinny.
 

bmurray2250

4x4 Earth Contributer
Toyota Prado 3.4L V6 1998 Petrol with Auto Gearbox

Here are the fuel usage for my vehicle over the last 2 years. The fuel test include highway, city and off road (including beach). I have run the Prado on E10 and unleaded and prefer the unleaded fuel. I have recently changed from the standard NGK spark plugs to a Bosch Platinum’s (FR8HPX) and have noticed better ecomony and starting. I will have to test this over the next 2 fuel loads to see the fuel use has improved or has gone back to normal use. In the last 10,000Km I have noticed a change in economy and believe it is plug related after getting them out of the heads

Litres/100KM

15.662
13.693
13.613
14.690
11.837
13.843
15.424
17.861
14.780
18.943
25.756
17.036
16.727
12.967
13.729
16.545
17.056
13.854
14.018
13.605
16.034
15.423
15.097
15.928
15.296
15.326
14.580
22.604
20.631
16.152
16.962
17.560
15.382
15.352
 

croozza

Active Member
Toyota Prado 3.4L V6 1998 Petrol with Auto Gearbox

Here are the fuel usage for my vehicle over the last 2 years. The fuel test include highway, city and off road (including beach). I have run the Prado on E10 and unleaded and prefer the unleaded fuel. I have recently changed from the standard NGK spark plugs to a Bosch Platinum’s (FR8HPX) and have noticed better ecomony and starting. I will have to test this over the next 2 fuel loads to see the fuel use has improved or has gone back to normal use. In the last 10,000Km I have noticed a change in economy and believe it is plug related after getting them out of the heads

Litres/100KM

15.662
13.693
13.613
14.690
11.837
13.843
15.424
17.861
14.780
18.943
25.756
17.036
16.727
12.967
13.729
16.545
17.056
13.854
14.018
13.605
16.034
15.423
15.097
15.928
15.296
15.326
14.580
22.604
20.631
16.152
16.962
17.560
15.382
15.352

Thats alot of data...... My Prado 3.4 is averaging 12lt/100km, infact yesterday I filled it to the brim, and drove 100km (GPS reading, even though my speedo is spot on!) filled it again today and could only get 10.12 lts in it.
25 was your highest so that should still get you around 700-750 km out of the tanks in a worst case senario. Was that towing?
If you want to get better fuel econ, try using a different air filter K&N or something like it, and don't use full throttle, as there is no need for that, 3/4 max as you don't get much more than that after it except burning more fuel.
 

bmurray2250

4x4 Earth Contributer
25l/100km was towing a trailer on Fraser Island, so I had the worst of both worlds. Fraser was storm effected and I had to drive on the softer sand. 11.8l/100KM was a trip from Marybrough back to Brisbane with the family and medium load.

I do had a K&N filter installed and is maintained correctly. It improved the economy but by very little. Do you have a snorkel and manual gearbox? Any configuration setup of your vehicle would be good.

I am not heavy on the pedals and coast up and up the hills. Presently using 15W/40 oil, K&N filter, new bosch spark plugs (only have done 350KM on them so no data yet). I don't have a snorkel but have been using flashlube in the fuel with unleaded fuel. 220,000KM on the clock. A friends Prado got 13l/100km but his wife was driving and she is softer on the pedals than he is.
 

croozza

Active Member
25l/100km was towing a trailer on Fraser Island, so I had the worst of both worlds. Fraser was storm effected and I had to drive on the softer sand. 11.8l/100KM was a trip from Marybrough back to Brisbane with the family and medium load.

I do had a K&N filter installed and is maintained correctly. It improved the economy but by very little. Do you have a snorkel and manual gearbox? Any configuration setup of your vehicle would be good.

I am not heavy on the pedals and coast up and up the hills. Presently using 15W/40 oil, K&N filter, new bosch spark plugs (only have done 350KM on them so no data yet). I don't have a snorkel but have been using flashlube in the fuel with unleaded fuel. 220,000KM on the clock. A friends Prado got 13l/100km but his wife was driving and she is softer on the pedals than he is.

Mine is a grande, so it is an auto, with all the fruit, I have added an ARB sahara bull bar, winch, Narva 225 HID's, lifted it 2 inches (EFS), getting rock sliders (one day), I use a K&N, got genuine Toyota Spark plugs at the moment, No snorkel, Use Conoco Ultraclear 15/40 for my oil. Got 260000 on the clock and drives like a dream.
 

bmurray2250

4x4 Earth Contributer
Mine is a grande, so it is an auto, with all the fruit, I have added an ARB sahara bull bar, winch, Narva 225 HID's, lifted it 2 inches (EFS), getting rock sliders (one day), I use a K&N, got genuine Toyota Spark plugs at the moment, No snorkel, Use Conoco Ultraclear 15/40 for my oil. Got 260000 on the clock and drives like a dream.


Your vehicle is very similar to mine, as mine is a Grande VX without the big HID lamps on the front. I haven't heard of Conoco Ultraclear before, do recommend it and where do you get it from? I am presently using Valvoline XLD Engine Armour 15W/40 which is a synthetic oil. I was looking at the DuraBlend for the next oil change.
 

croozza

Active Member
Your vehicle is very similar to mine, as mine is a Grande VX without the big HID lamps on the front. I haven't heard of Conoco Ultraclear before, do recommend it and where do you get it from? I am presently using Valvoline XLD Engine Armour 15W/40 which is a synthetic oil. I was looking at the DuraBlend for the next oil change.

it is the best oil I have ever used, contact on track 4wd centre at slacks creek (springwood) they have it there. 32902533
 

bmurray2250

4x4 Earth Contributer
Contacted on Track 4wd centre and they don't supply it any more. He rates it a good. Thanks for the help
 

croozza

Active Member
I did hear he may be changing over to a different brand as it was getting hard to get and costing alot too, but wasn't sure if he had yet.
 

bmurray2250

4x4 Earth Contributer
The new plugs have shown better results. History shows I get 7KM/l or better on long highway trips. This result of 6.9KM/l has the 4 hours of low range driving in it. Will be interesting to see the highway results.

5.895 City driving
5.695 City driving
6.501 City and Gold Coast
6.514 City and Gold Coast
6.914 City driving and Jenowen Hill 4x4 trip
 
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