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BigJimnyMeet (North) 2024 (12 Jan 2024)


BigJimnyMeet 2024

14th July 2024
Parkwood Nr. Leeds

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BF Goodrich ATK02 Fuel Consumption

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17 Mar 2023 21:54 #248081 by Williams
Thinking of changing the original Dueler tyres on my gen4 Commercial to BF Goodrich all terrain tyres and wondering if anyone has done this and has it affected fuel consumption and performance?

The other tyres I'm considering are the Fallen Wildpeak AT3W and would be interested if anyone has experience with these tyres after running the factory fit tyres?

Many thanks

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18 Mar 2023 09:08 #248084 by Roger Fairclough
I have the BFG All Terrains on my Gen.4 and can advise that you will loose 2 mpg in normal use. Noise will increase, but it is marginal and performance is also slightly affected but again, it is marginal. Grip on the road, wet or dry is still very good, surprisingly so considering you are driving a tall short narrow box with beam axles!

Roger
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18 Mar 2023 11:37 #248085 by Roger Fairclough
Just some more info.
Original tyres 195/80R15, tread width on ground 150mm.
BFG tyres LT215/75R15, " " " " 180mm.

Roger
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18 Mar 2023 17:12 #248089 by DrRobin
When you said 2mph less is that from the speedo/computer/odometer/trip computer as 215/75 vs 195/80 will cause the car to under read speed & distance by about 1.5%?

2020 blue SZ5 (one of the last to be registered in the UK)
Ex 2011 Blue Jimny SZ4
Northumberland Jimny Blog

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18 Mar 2023 19:22 #248090 by Roger Fairclough
The mpg figures come from the on board computer and therefore do not take into account the difference between the rolling circumference of the two tyres, but the BFGs are worn to a greater extent than the std tyres and so the difference would be reduced to close to zero. Also the loss figure of 2mpg is not a percentage but actual. If I try to convert to percentage it would be close to 5.

Roger
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18 Mar 2023 20:18 - 18 Mar 2023 20:20 #248092 by fordem
If you plan on sticking with the OE tire size, I would not expect a noticeable difference in fuel consumption or performance, switching the tread pattern from a highway tread, which is what I think the commercial is fitted with, to an all terrain tread may be more noisy, but I would not expect it to be significant.

I went from the OEM (195/80R15 Dunlop) tires on my JB74, to a slightly taller 215/75R15 General Grabber A/TX, the change in road noise was not noticeable, road holding & ride quality were significantly improved, the impact on performance was just noticeable, this however was not reflected in the fuel consumption.

I do not rely on the on board computer for fuel consumption numbers, I maintain a spreadsheet and enter the quantity of fuel added at each fill up and the odometer reading at that time - consumption does vary from one tank to the next, and I generally don't lose sleep over it.

If you plan on changing the size, that is likely to have a bigger impact on performance & economy than changing the tread pattern
Last edit: 18 Mar 2023 20:20 by fordem. Reason: additional comment
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18 Mar 2023 22:49 #248096 by Jambls
I put k02s on my 04, I can't say for sure as they're a larger size, but I don't think it's had a huge effect on fuel. They replaced a worn set of knock off  k01s (standard size), and I found them to make it slightly slower to 60, and wander more in corners, probably with the extra tread, but off road they're fantastic.

04 mode, nearly unmodified.
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22 Oct 2023 22:39 #251660 by Williams
I made the purchase and fitted the BF Goodrich AT KO2 215/75/15 to my Gen4 LCV and it does look great. Did a bit of off roading and they are certainly more capable then the Dulers that were supplied with the van.

I've done about 300 miles in it this week and normally on that work trip away for 5 days I always get somewhere in the 38mpg bracket, but was somewhat disappointed to only get 33.4mpg this week which is more of a drop than I had expected. I've had my tyre pressures set to the recommended 26psi for light loads so have now upped them to 30psi around to see what difference that makes.

I was wondering what other people are setting there tyre pressures to with the same setup? And if you're sticking to the Suzuki recommend tyre pressures for the standard tyres?

Performance has also taken a knock I've got to test it exactly on the same piece of road but from an early test I think the top speed is down by the best part of 10mph (obvs I tried this on the Autobahn) and performance through the gears is also noticeably reduced.

The vehicle feels more taught when cornering in.the dry with good traction when pressing on, but in the wet depending on the tarmac they really aren't great. Maybe a few more miles to take the top layer off them may help with this.

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23 Oct 2023 06:55 #251662 by Busta
Remember that any change in tyre size affects both the odometer (distance you travel) and the speedometer (speed you drive). Even a small increase of 2% will see you recording 2% fewer miles whilst driving 2% quicker, the cumulative affect being a higher perceived fuel consumption when it may not have changed at all.
The only accurate way to measure is tank-to-tank, adjusting the mileage for the change in tyre size. I'd be surprised if you saw any change.

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23 Oct 2023 08:36 #251665 by Roger Fairclough
A drop from 38 ish to 33.4 is 12%. Differences in tyre dia. are present but even so 12% begs the question in big letters WHY. Is this an error in the maths or a problem with filling up the tank? Yes, do it all again to eliminate problem areas and use a different fuel pump at the station. Your original figure of 38 is a bit low but probably due to how you need to drive and where you do your driving. You must, obviously, do your best to duplicate everything that was the normal routine.
We await the new results with baited breath!

Roger

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23 Oct 2023 09:12 #251668 by 300bhpton

I made the purchase and fitted the BF Goodrich AT KO2 215/75/15 to my Gen4 LCV and it does look great. Did a bit of off roading and they are certainly more capable then the Dulers that were supplied with the van.

I've done about 300 miles in it this week and normally on that work trip away for 5 days I always get somewhere in the 38mpg bracket, but was somewhat disappointed to only get 33.4mpg this week which is more of a drop than I had expected. I've had my tyre pressures set to the recommended 26psi for light loads so have now upped them to 30psi around to see what difference that makes.

I was wondering what other people are setting there tyre pressures to with the same setup? And if you're sticking to the Suzuki recommend tyre pressures for the standard tyres?

Performance has also taken a knock I've got to test it exactly on the same piece of road but from an early test I think the top speed is down by the best part of 10mph (obvs I tried this on the Autobahn) and performance through the gears is also noticeably reduced.

The vehicle feels more taught when cornering in.the dry with good traction when pressing on, but in the wet depending on the tarmac they really aren't great. Maybe a few more miles to take the top layer off them may help with this.
I noticed the performance impact when I fitted 215/75R15 AT's (Maxxis Wormdrive). It was less peppy on acceleration. Can't say I really notice much difference in top speed though.

MPG wise, running about locally I get 32-34mpg. Although a long run the other week returned 38.6mpg, but it was cross country and driving gently. Motorway driving (anything over 3000rpm) IMO makes it drink fuel. A long motorway stint at 70mph on cruise control will see low 30s.

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23 Oct 2023 12:08 #251679 by DrRobin
If you had 195/80R15 on your LCV and went to 215/75/R15 that is only 1.5% bigger, so your speedo would under read by 1.5%, no where near enough to make any meaniingful difference.

However, they 215/75/R15 tyre will probably weigh a fair bit more and it is likely that it is the extra weight increases the inertia and leads to higher fuel consumption.

Also the rolling resistance of the KO2 is probably much higher than the Dueler (road tread) tyre.

12% sounds a lot, I didn't notice as much difference going from 205/70 road/AT to 215/75 Maxxis on my Gen3, then the speedo was further out than your move.

Robin

2020 blue SZ5 (one of the last to be registered in the UK)
Ex 2011 Blue Jimny SZ4
Northumberland Jimny Blog

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