Fuel Econ

Submitted: Tuesday, Oct 14, 2003 at 08:25
ThreadID: 7806 Views:1440 Replies:6 FollowUps:2
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Do skinny tyres and fat tyres make much difference to fuel economy? _____________________________________________

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Reply By: Member - Ross- Tuesday, Oct 14, 2003 at 08:39

Tuesday, Oct 14, 2003 at 08:39
Not too sure but I would expect for identical circumference the skinny ones may tend to have less rolling resistance and as such may return better fuel consumption.Rosco
AnswerID: 33697

Reply By: Truckster (Vic) - Tuesday, Oct 14, 2003 at 12:54

Tuesday, Oct 14, 2003 at 12:54
Skinny ones less resistance on the tar....

Then you can go for Larger Diameter V Narrow...
Larger changes your gearing so it has to work harder to get moving.
AnswerID: 33730

Reply By: Voxson (Adelaide) - Tuesday, Oct 14, 2003 at 13:59

Tuesday, Oct 14, 2003 at 13:59
I ask these questions because i am confused........
I have stated in previous posts that my fuel economy is on average about 12.8litres per 100 whether i am in the country or not..... From those posts i have people telling me that i must be heavy footed or over revving it because i should be getting 10 - 11litres per 100.....This is a vehicle that weighs at least 2300kgs and is powered by a 4200cc diesel engine...I rekon 12.8 is pretty good....

I have even driven with a tail wind at 80kmh for 600kms and got 12.4litres per 100.
I rang the RAA, RACV or whatever it's called all over the country and they told me about 12.5 - 13 litres per 100 is as good as it gets..

I have got 33" tyres which cant help much and are 12.5" wide so i am happy with results now..

I also bettered my fuel economy... I simply filled my car up the other day and when the pump clicked off i squeezed another 2½ litres into it and i travelled a mere 400kms then filled up again but only till the pump clicked off the first time and did my calculation and received a figure of 11.2litres per 100.... So i can see how it is done...

When i do my calculations it is after i have used my whole fuel content of 200litres
which gives a very much lesser error because of a click or two different at the pump when refilling..._____________________________________________

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AnswerID: 33737

Follow Up By: Member - Roger - Tuesday, Oct 14, 2003 at 17:40

Tuesday, Oct 14, 2003 at 17:40
Your not doin too bad at all, if you want great fuel economy stay away from a 4wd and buy a small car. My 4.2 Td GU burns 13 to 15 ltrs per 100 depending where I go and up to 18ltrs per 100 when towing a 1.8t van. So be pleased that it is still going without any probs. But a sure as sheep have wool I bet someone will always claim a lot better than either of us.
RegardsDodg
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FollowupID: 24247

Reply By: JohnH - Tuesday, Oct 14, 2003 at 18:00

Tuesday, Oct 14, 2003 at 18:00
Voxson I'm getting 20lt per 100 around town out of my Suburban and I brag about that. Never bought it for it's economy though, I would be happy with your figures. I think the skinnier the tyre the better the economy personally. I am running 255/85R16 on my truck.

Cheers

JOHNH
AnswerID: 33767

Reply By: Eric from Cape York Connections - Tuesday, Oct 14, 2003 at 19:28

Tuesday, Oct 14, 2003 at 19:28
Voxson I have just come back from western NSW and I was doing a bit of a fuel coparo on my 1985 turbo 60. I found if i pushrd the old girl around 110ks/h the fuel just disapeared about 15.8l/100 but if I just cruised I will get 12.8/l/100. Cruising is about 100k/h.Thats for a loaded truck with roof rack with swags on top.
If you do trip of 10,000 k that adds up .
All the best
Eric
4x4 tag along adventures.Cape York Connections
AnswerID: 33780

Reply By: Eric Experience. - Tuesday, Oct 14, 2003 at 21:29

Tuesday, Oct 14, 2003 at 21:29
Voxson.
You do not state whether you are compensating for the tyre diameter in your km figures, if you don't compensate then you are actualy travelling more k's than you think. But to answer your question, you do use more fuel with wider tyres especualy in soft ground as you have to move more sand or dirt, and on hard surfuce you are flexing more rubber. Eric.
AnswerID: 33805

Follow Up By: Voxson (Adelaide) - Tuesday, Oct 14, 2003 at 21:33

Tuesday, Oct 14, 2003 at 21:33
Hi Eric... I have checked my speedo with my GPS and i am taking the difference into consideration...
I have just removed my factory hiclone thingy from the snorkel last weekend and will see if that has changed anything..._____________________________________________

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