Fuel Consumption with mud terrain tyres

Submitted: Monday, Jan 10, 2005 at 10:29

ThreadID: 19220 Views:10248 Replies:9 FollowUps:13

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GUPatrol

Got an interesting question which I would like to run past to see if
anyone has come across it.

GU 4.2 TD 99 with BFG All terrains 265/75 16 uses about 12.5 to 13.5L
per 100kms (consistently through its whole life).

I got two sets of rims and some months ago I fitted BFG 265/75
16 "MUD" terrains to the second set.

When using the mud terrains it uses more fuel, between one to two
litres per 100kms more fuel (consistent over several fuel tanks
now)...

Change back to A/Ts and its back to its old consumption...

Has anybody experienced this? Driving conditions are varied but the
same for both types of tyres...

I have measured the tyre diameters and mud terrains are 5 to 8mm
larger due to lugs

Has anybody experienced this? Why is it?

Will

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Reply By: flappan - Monday, Jan 10, 2005 at 10:52

Reply By: Member - Bradley- Monday, Jan 10, 2005 at 10:56

Reply By: Leroy - Monday, Jan 10, 2005 at 11:31

Reply By: Truckster (Vic) - Monday, Jan 10, 2005 at 11:51

Reply By: warthog - Monday, Jan 10, 2005 at 12:52

Reply By: Bloke - Monday, Jan 10, 2005 at 13:17

Reply By: Voxson (Adelaide) - Monday, Jan 10, 2005 at 13:54

Monday, Jan 10, 2005 at 13:54

I went through this crap months ago and i proved beyond doubt that the tread on certain muddies walks around on the road as it is having drive put through it....(exactly the same theory as riding a mountain bike with a rear shocker on the road)... The power lost through this soft spot in the drive-line is very noticable... If your car didnt have a turbo you would have noticed a loss in HP also...
This soft spot soaks up horsepower....I fitted a turbo and have bettered the fuel economy to 15litres per 100 and gained good power...Expensive tyres in my case...

AnswerID: 92194

Follow Up By: GUPatrol - Monday, Jan 10, 2005 at 14:46

Monday, Jan 10, 2005 at 14:46

Voxson,

You are spot on!! I did loose HP also, only noticeable on certain hills where 5th was borderline before and now I have to change back to 4th.
Your point is dead right as I also notice a slight difference in braking ability...

Will

FollowupID: 350996

Follow Up By: Member - Bradley- Monday, Jan 10, 2005 at 16:46

Monday, Jan 10, 2005 at 16:46

Yeah Voxy, i remember your post a while back, and you are dead right about the 'squirm' My MTR's squirm and howl like buggery when i put the boot into it, to the point where i avoid it now if i can. I hoped to get a good all round compromise without having 2 sets , but i cant live with the lack of braking ability on the road, hopeless grip in the wet, and the squirm etc. Shame because they are not too noisy on the road. So i'm going to have to look for a set of roadies as well.

FollowupID: 351031

Follow Up By: GUPatrol - Monday, Jan 10, 2005 at 17:06

Monday, Jan 10, 2005 at 17:06

Bradley,

That is exactly what I found, not too noisey.
In fact we were returning from a trip to the beach at xmas via a twisty road and I pointed out to my wife the squirm every time conditions changed such as up hill down hill and on turns.

Will

FollowupID: 351039

Follow Up By: Member - Bradley- Monday, Jan 10, 2005 at 17:27

Monday, Jan 10, 2005 at 17:27

Yeah it feels like the alignment is out to buggery as well.

No way i'll get rid of them as they are awesome off road and ok for touring, but i will get some nice road biased jobs for general work, something like the bridgestone d680.

FollowupID: 351043