GQ Fuel economy!!!???

Submitted: Sunday, Jun 27, 2004 at 23:57
ThreadID: 14197 Views:11665 Replies:6 FollowUps:7
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Hi everyone, nice to see that forum still requires minute to minute update to be on track!!!

Now, I've just read on some 4X4 revirew about GQ patrol, it states that 4.2 diesel is more fuel economical that 4.2 petrol, but on the consuption comparison it shows that petrol drinks 15L/100Km and diesel 18L/100Km. Now tell me please how is it that diesel is more fuel economical? Is diesel Km longer than petrol? I don't think so!!! : ) Now days there is no price difference between ULP and Diesel, so I can't figure it out on my own!

How are your experiences with 4.2 diesel fuel consuption?

All these questions are coming from the taught about upgrading from "terry" to Patrol, as soon as possible,terry is very underpowered, if it doesnt improve on power and consumption after injector and pump service, it goes for sale for sure! Budget is limited to GQ, can't think about GUs, no way!

I wouldn't like to switch to petrol/gas setups, it would be nice to keep on diesel power, but these consuptions and fuel prices are scarring me a bit!

Your appreciated taughts are very wellcome!!
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Reply By: Truckster (Vic) - Monday, Jun 28, 2004 at 00:37

Monday, Jun 28, 2004 at 00:37
Theres a poll on the GQ list at moment.

If your on gq list have a look at

These are all 4.2s

10-12 ltrs /100klm 44.00%
13-14 ltrs /100klm 28.00%
15-17 / 100 20.00%
18-20 / 100 4.00%
worse than that 4.00%

10-12 ltrs /100klm 0.00%
13-14 ltrs /100klm 11.11%
15 20/ 100 56.67%
I dream of better than that 22.22%

10-12 ltrs /100klm 0.00%
13-14 ltrs /100klm 11.11%
15-17 / 100 22.22%
18-20 / 100 22.22%
I dream of better than that 44.44%
AnswerID: 65456

Follow Up By: Member - Dragan T (VIC) - Monday, Jun 28, 2004 at 00:41

Monday, Jun 28, 2004 at 00:41
Damn, this is more like chat room than forum!

Thanx on super fast reply!
FollowupID: 326394

Reply By: Voxson (Adelaide) - Monday, Jun 28, 2004 at 07:47

Monday, Jun 28, 2004 at 07:47
I have a very uneconomical setup GQ and i still get 13.5litres per 100....
I have 33" tyres with a roof rack full time and often fill my tanks to 220litres.....

My last petrol (4.2 also).... got me 22litres per 100 round town and 19 on an easy run...
AnswerID: 65461

Reply By: Flash - Monday, Jun 28, 2004 at 08:42

Monday, Jun 28, 2004 at 08:42
My GQ 4.2 diesel averages 11.5 litres / 100kays over the last 70,000 (quite a bit of towing but I don't push it all that hard, and don't have wide wheels or roof rack which will use a tad more)
- have always kept a log as it's a good way to know when injectors etc etc need service.
All petrol GQs get WAY worse economy than that.
AnswerID: 65465

Follow Up By: Flash - Tuesday, Jun 29, 2004 at 07:49

Tuesday, Jun 29, 2004 at 07:49
for the skeptics out there...
that is over the whole 70,000 kays, accurately logged and calculated manually occasionally AND on a computer spreadsheet program which can give me averages over any selected time period. Forget about an ACCURATE average over one tank- it's usually too hard to fill the tank to the brim both times. Also, how accurate is your odometer/speedo- check with a GPS and you may be surprised.
The worst I've ever had between fills from memory (towing a van/headwind) was about 16l/100kays.
A few other things to consider:
1. "Dead" weight in the car will increase consumption. Keep those unused items out of the car when not needed. I even removed the extra two seats in the back because my kids have grown up and I don't need them any more.
2. Low tyre pressures likewise use more fuel.
3. Wider tyres likewise
4. Roofracks ditto
5.A radiator fan running all the time will also use a lot of fuel! (When i first added extra silicone to my fan it ran all the time- nice and cool but economy suffered considerably!)
6. Some people leave their engine idling at various times for lengthy periods- this wastes significant fuel- even more so in a petrol.
7.Your aircon uses fuel. If it's not too hot, leave it off. (One of my sons used his all the time on his Commodore. I talked him into leaving it off a lot and even he was amazed at the extra klms he got from a tank!)
8. Dirty air filter, bad injectors, restrictive exhaust all are bad news.
9.Obviously low ratio, serious four wheel driving guzzles gas!
10..Finally and most obviously.... if you're first off at the lights and also drive fast, you will use WAY more fuel.

Most of this is very obvious stuff, but with fuel at over $1 a litre, and quite possibly closer to $2 a litre very soon with the mess in the Middle East, (eg:If the Saudi government is tossed out, which the militants are trying to do, expect $2 or more a litre almost overnight) every drop counts!
FollowupID: 326554

Reply By: Member - Dragan T (VIC) - Monday, Jun 28, 2004 at 11:24

Monday, Jun 28, 2004 at 11:24
As always, thanks for qucke response lads! Now, as far as I know, GQs don't have turboed 4.2 diesels, only 2.8, can anyone tell me otherwise?
AnswerID: 65483

Follow Up By: Truckster (Vic) - Monday, Jun 28, 2004 at 11:52

Monday, Jun 28, 2004 at 11:52

GQ came in

2.8 Turbo Diesel
3.0 Petrol N/A (but same motor as Skyline and VL commodore)
4.2 Diesel N/A
4.2 Petrol N/A

Some imports do have Turbo on them in 4.2 diesels.
FollowupID: 326429

Follow Up By: Member - Dragan T (VIC) - Monday, Jun 28, 2004 at 12:04

Monday, Jun 28, 2004 at 12:04
That is a shame, I would like turbo on the diesel, well maybe it will come on down the track. Still 4.2 diesel is the best choice I reckon. 4.2 petrol, thirsty! RB30 carbureted, underpowered, 2.8 TD, underpowered as well they say. Not sure about TD2.8 underpower but that is the story that I'm getting. If my 2.7 turbo diesel is lazy with terrano, 2.8 will be even lazier with Patrol I reckon.
FollowupID: 326432

Follow Up By: Truckster (Vic) - Monday, Jun 28, 2004 at 12:06

Monday, Jun 28, 2004 at 12:06
Good aftermarket turbo will cost around $3-4000... not that bad for the power increase.

And you would also have the Diesel behind you that wont die. Go the TD42.
FollowupID: 326434

Reply By: Voxson (Adelaide) - Monday, Jun 28, 2004 at 14:01

Monday, Jun 28, 2004 at 14:01
I have owned my 4.2 N/A GQ for a while now... When i first got it i wanted a turbo so bad because of the lack of power... Since then i have learnt to drive it properly.... (I am not having a go a turboed Patrol drivers because the next one i get will be a GU turbo)....
But anyway,,, when i first got this vehicle a good benchmark was to go straight up a huge long bitumen hill which always tests vehicles.....
In my older 4.2 petrol i could sustain 90 in 4th all the way up (about 4kms) and with the diesel i could start the climb at 95kmh and at the 3/4mark i would be struggling to do 65.....
So after months of learning the throttle technique i can start at 95 and finish with still 90ish on the speedo....
All to do with throttle positioning and learning about your vehicle...
That is the only annoying part about owning a diesel.... All the rest like slow hill climbing, sand dunes, economy, water crossing ability is all a huge plus...
AnswerID: 65507

Reply By: Member - Dragan T (VIC) - Monday, Jun 28, 2004 at 17:28

Monday, Jun 28, 2004 at 17:28
Hm, so I can see taht cdiesel consuptions are all over the place!!! From 10 to 20 L/100Km Damn that is a nice span! With my luck, mine will drink 25! It's nice to hear that 4.2 is not that thirsty as I taught. With my experience with TD27T from terry that gulps 15L/100Km I taught every 4.2 is over 18L/100 Km range. But more clear picture will come after terry goes for some surgery.
AnswerID: 65541

Follow Up By: Truckster (Vic) - Monday, Jun 28, 2004 at 20:15

Monday, Jun 28, 2004 at 20:15
Remember everyone drives differently.

14l/100klms is pretty common, Ive got 19l/100 out bush, with lots of sand work and low range....

Some state they get 11l/100klms, Id be buying a new calculator if I was them...

FollowupID: 326495

Follow Up By: Voxson (Adelaide) - Monday, Jun 28, 2004 at 20:43

Monday, Jun 28, 2004 at 20:43
I can get 11kms per litre also.....
Firstly i have to fill my tank wery wery slowly and when it clicks off i can still get 15litres into it......

Then when i empty it and refill it, i can pull the pump on flat-out and make the diesel froth up and click the pump off and then go to the next dollar... And BINGO,,,,, about 11litres per 100 or better after my PRECISE calculation...RIGHT?.... You got that?.........*lol*
FollowupID: 326501

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