Instant fuel increase

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Originally Posted by Redback

13L/100K towing the camper:eek: I'd be over the moon with those figuers towing, I get between 14.5l/100k to 16l/100k depending on terrain, towing our 1400kg to 1500kg camper and that's with our 265/60/18 D697s ATs and not the KM2 muds:(

I hate you, I hate you, I hate you, did I mention I hate you:angel:

Cooper tyre are crap, had them, never again.

Baz.

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I dont have a roof rack either so assume that would count for a bit.

I agree about the coopers, only reasoni have them is they came withthe rims. They will be getting sold once im back home.

Cheers Ean

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Originally Posted by Ean Austral

Gday Baz,

No took off the 18s with road tyres and put on these cooper stt and the whole car is different. Ever since we have had the car it is consistantly around 10l / 100ks but just done an 800km run and we averaged 13.4 towing camper which is 2.4 up on rvery other trip i have done.
By the way Ron moon is full of **** i have slready changed a tyre due to a slow leak in only 800ks.
Cheers Ean

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Those STTs are big chunky heavy things which might be fine in mud, but are not good on bitumen - noisy, affect fuel consumption and steering feel and lengthen braking distances I would expect, judging from what happened when I put MTRs on our D1.
Most people spend most of their time on bitumen, so why run a tyre which is mainly for something else? That's my theory.
I'm going to stick with ATs.

hahaha you guys !!!


I used to drive a petrol 80 series with 35" mud tyres.... I was stoked if I got 650km from a 130 litre tank!!!


I get an average of 12.5 with 265/65/18 ATs and a roof rack (not taking into account the difference from the larger rolling dia.)


going to change to 265/70/17 muddies when I get back from Darwin.
will see how that go but same diameter so not expecting too much difference.

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Originally Posted by DiscoMick

Those STTs are big chunky heavy things which might be fine in mud, but are not good on bitumen - noisy, affect fuel consumption and steering feel and lengthen braking distances I would expect, judging from what happened when I put MTRs on our D1.
Most people spend most of their time on bitumen, so why run a tyre which is mainly for something else? That's my theory.
I'm going to stick with ATs.

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I agree totally , i only put them on to do 2 weeks offroad in the kimberleys then will put the road tyresback on. Not my preferred choice of tyre even for offroad but the price was right so they are what i have.

Cheers Ean

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Originally Posted by Ean Austral

Gday All,


Put some mud tyres on the D3 and the fuel computer went up 2 ltr /100 almost instantly. I expected the economy to suffer but didn't expect the computer to notice it that quickly. I would expect real figures will be worse.


Certainly know they are on the car that's for sure.


Cheers Ean

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Allow me to share some numbers
Average tyre weight for an LT, say 118 up is around >37kg incl. alloy rim. Allow another 7kg for steel. This is an increase over a standard tyre and rim of around 17kg so time five equals +75kg. Now allow for the increased rolling resistance, can be up to +50% and you begin to get my drift

Roof rack with bars adds on average .7 to 1.2l per 100km empty. Fill it and double those figures

Which is one of the many reasons why we ask all our tour clients to weigh their cars, front, all and rear axle weights before a tour so they get an idea if why we have probably asked them to carry and additional 60l of fuel for a Simpson Crossing for example

Hope that helps

Regards

Rob

Well the numbers are in, 1150ks all sealed road was 150ltrs so 13/100ks and 1245ks / 148lts mostly dirt but at a slower speed average of 70ks/hr.

Funnily enough the cars computer was within 0.2ltr both times.

Still up on the H/T tyres but expected it.

Cheers Ean