Interesting Comparison

Submitted: Thursday, Sep 14, 2006 at 17:29
ThreadID: 37717 Views:2476 Replies:5 FollowUps:12
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Done the drive from Karratha to Perth twice now. Same route, same weather.

Both trips were all highway tyring to do it asap.

First time with a 2004 V8 cruiser with a Thule roof box and 3.5T boat, driving very hard, also did a bit of city driving (with boat on) through Canarvon and Gerro - got 21 to 25L/100km

Second Time in a 2005 Triton GLX-R TD (2.8L) towing at Jayco Expanda coming in at 1.7T, driving at night so taking it pretty easy - got 23 - 26 L/100km.

I thought I would take the Triton to save money, ended up costing a few hundred dollars more in fuel & gerry cans, took longer, couldn't overtake, had to fill up every 260km and not as comfortable!!!!!
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Reply By: Robin - Thursday, Sep 14, 2006 at 19:00

Thursday, Sep 14, 2006 at 19:00
Hi Barks

They are interesting comparison's.

When comparing two situations like that its good to note a couple of points.

First that wind resistance dominates , and the force required to maintain a higher speed varies at the cube of the speed. (Wind resistance Goes up real fast ).

Second , while as a rough average diesels have around 1/3rd better range per litre , this drops off rapidly as they get out of their comfort zone.

In the series car I drive (Patrols) the 33% better economy at 100kmh for 4.2TDI drops to around 17% at 120kmh, over the 4800 petrol I drive.
Would like to have completed tests at around 140kmh , but the old 4.2 engine struggles to get their.

My guess is that both factors were working in your case.

Robin Miller

AnswerID: 194572

Follow Up By: Member - Shane D (QLD) - Thursday, Sep 14, 2006 at 19:18

Thursday, Sep 14, 2006 at 19:18
Hi Robin
slightly off subject,but what sort of economy to u get with the 4800,I was considering buy a 2004, but had concerns on what it would cost to feed the beast
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Follow Up By: Robin - Thursday, Sep 14, 2006 at 20:05

Thursday, Sep 14, 2006 at 20:05
Hi Shane

Economy is the sum life cycle cost of ownership.

Its a car that can deliver a wide range of fuel useage , I mostly drive conservatively and car is set for good consumption.

The offical figures are 17.2 auto and 17.7 manual (lts/100km)

Mine has recorded an average of 16.5 lt/100km over 100,000+ km's.

Recent north simpson crossing with a bit of cross country returned 24lt/100km as did putting the wheels in the mouth of Murray up the Corong.

The cruise to Birdsville @ 100km average delivered 14.9lt/100km

Their a steal at moment and you can bargain good prices but I'd act before the heat comes off fuel costs again.

Life's to good to be true lately, now you can even get the government to pay for a later gas conversion, but no compromises for me.

Shane - get one, ( pre- 2006 model) and you will be astounded that a vehicle capable of 200kmh can also lug along with the best of them at 2kmh.

There's near nothing to service on them and even the plugs only have to be changed once every 100,000k's.

Robin Miller
GU4800 manual

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Follow Up By: Member - Shane D (QLD) - Friday, Sep 15, 2006 at 18:37

Friday, Sep 15, 2006 at 18:37
thank you for the detailed info

cheers
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Reply By: Member - Oldplodder (QLD) - Thursday, Sep 14, 2006 at 20:31

Thursday, Sep 14, 2006 at 20:31
Noticed similar figures with my 2.8l pajero, same engine as the triton, when towing.
Derinitely prefers sitting on 90/95, even 80/90 if you have the time.
Fuel economy really drops off after that.
2200/2500 rpm in 5th seems a magic rev range for a compromise between speed and economy. 2800 rpm is 100kmh.
AnswerID: 194581

Follow Up By: Barks - Friday, Sep 15, 2006 at 10:11

Friday, Sep 15, 2006 at 10:11
yep, I couldn't hold 5th on flat road (90 - 100), seemed to really struggle, did it a lot easier in forth.
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Follow Up By: Member - Oldplodder (QLD) - Friday, Sep 15, 2006 at 20:06

Friday, Sep 15, 2006 at 20:06
Sounds strange.
Must have been towing a very heavy wieght.
Maybe fuel filter a bit blocked? A regular problem on the Mitsu's.
Fuel consumption goes up as well!
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Reply By: fisho64 - Friday, Sep 15, 2006 at 00:19

Friday, Sep 15, 2006 at 00:19
without saying "no way", I kind of find the cruisers figures a bit suprising?
I looked at buying a V8 cruiser, before getting a TD, and having posted requests for info and asking owners I know. And to quote
"2004 V8 cruiser with a Thule roof box and 3.5T boat, driving very hard"
would be suprized to get 21, maybe 25 but I would have thought more than that even? A good % of owners told me up to 20L/100km WITHOUT the added 150% tow when being driven hard!
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Follow Up By: Barks - Friday, Sep 15, 2006 at 10:10

Friday, Sep 15, 2006 at 10:10
take it how you like, these are facts and I'm very precise when recording figures
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Follow Up By: fisho64 - Friday, Sep 15, 2006 at 14:44

Friday, Sep 15, 2006 at 14:44
just a comment, dont take offence please-none was intended
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Reply By: Big Woody - Friday, Sep 15, 2006 at 06:02

Friday, Sep 15, 2006 at 06:02
There have been some comments on the towing figures with such a heavy load.
I believe that aerodynamics come into play much more than the weight of the towed object. As the yacht is pointy at the front it cuts the air more efficiently. I have proven this with my own fuel consumption figures in my T/D 80 Series Landcruiser. I tow a 3 tonne yacht regularly and the cruiser can return figures of 14-15L/100km on the highway. When I tow our caravan weighing only 1200kg it will use about 17-18L/100km.
I can even feel the difference between them and really don't notice the boat on the back as much as I do when towing the van.
I might just start using the yacht as a caravan on long trips and have the best of both worlds when we stop at places where the sailing is good.

Cheers,
Brett
AnswerID: 194623

Follow Up By: Member - andrew B (Kununurra) - Friday, Sep 15, 2006 at 08:17

Friday, Sep 15, 2006 at 08:17
Gday Brett

I have had similar results with towing 2 different boats. The wakeboard boat I used to have was about 2 tonne all up, and the tinny I tow now is probably arount the tonne mark. The Wakeboard boat was relatively low and wide, and had a full custom cover, wheras the tinny has no cover, is not what you'd call 'sleek', and has a tallish centre console which sits square to the aparent wind and is about 1.7 high x 0.6 wide. Towing economy was about 1.5l/100km better with the heavy but sleek boat.

I think the gap would be a lot narrower, and may even go the other way in mountainous, hilly roads where the weight has to be hauled up hills, but its pretty flat up here, so once the weight is mooving at speed the wind resistance is the major factor.

Cheers Andrew
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Reply By: Dave ....Adelaide - Friday, Sep 15, 2006 at 12:50

Friday, Sep 15, 2006 at 12:50
every time i go away on a trip i get the same old question from people ya meet along the way...."what fuel consumption ya gettin" my answer dont know and dont care , cause the way i see it is if ya gotta worry about how much fuel you may be or may be not using then ya may as well stay at home ......Cheers .....Dave
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Follow Up By: Barks - Friday, Sep 15, 2006 at 12:56

Friday, Sep 15, 2006 at 12:56
yep I agree, but unfortunately I'm a Mech/Elec engineer and just love analysing stuff like this - it's the part of the holiday I like!!! I don't get worried or stressed over it, just enjoy the trying to figure out the best way to travel from A to B; and drive the missus crazy.
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Follow Up By: Dave ....Adelaide - Friday, Sep 15, 2006 at 13:02

Friday, Sep 15, 2006 at 13:02
Hi Barks

Glad to hear ya dont stress over it mate ..lol.....the amount of people i meet along the way who do stress is ridiculous bloody heart attack over fuel usage ...lol..... Cheers mate ......Dave
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Follow Up By: V8Diesel - Friday, Sep 15, 2006 at 18:47

Friday, Sep 15, 2006 at 18:47
Dave, your a man after my own heart. I tell the Pal eaters to go and scavenge up the old soap scraps from the drains in the showerblock or reuse their teabags for the nineteenth time if they're that worried about it.

It costs what it costs - simple as that. If you can afford to spend upwards of 50K on a whizz bang 4x4 you can afford the fuel. Stop bellyaching about it and enjoy your trip. It sh*ts me to tears.

I just bought another V8 yank tank three days ago as a matter of fact. What a blast that old girl is - 42 years young and still going strong.

Life is too short - enjoy it!
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Follow Up By: Dave ....Adelaide - Saturday, Sep 16, 2006 at 09:42

Saturday, Sep 16, 2006 at 09:42
very well put V8 , couldnt have said it any better myself..haha When im on holidays mate the last thing i wanna be worried about is how much fuel im using, i have a 4.2 td gu patrol and tow a 17ft caravan and a 13ft tinnie on the roof of the patrol , just returned from a trip up north to roper bar across to Giru near Townsville and back home again was gone about 8 weeks and my fuel consumption for 10200 klms was 3000 bucks how that equates into klms per litre i dont know and dont give a bleep e ...lol.......just get out and enjoy as much as ya can while ya can cause it aint gonna get any cheaper tomorrow .......Cheers ........Dave
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