Thread: Instant fuel increase

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

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.

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.

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

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

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