MPG impact with 35 x 11.5 Tires

[okiesnake]

Does anyone have actual change in MPG from switching to 35 x 11.5 tires.
I have a Sport S with Max Tow package- therefore wider axles and 4:10 gears.
I like my stock rims so was looking at Toyo Open County AT III because they are spec’d for 17x7.5 rims and have 50K warranty.
I know they maybe too Pizza Cutter for some but I think I will be OK with them.
I currently have the Dueler AT LT245/75R with a Tread width of 7.4”, 31.5 diameter and 42 lb weight.

Toyo 35x11.5
Tread width of 9”, 34.5 diameter and 62 lb weight.

So a 1.6” wider and therefore a little more rolling resistance and 20lb more weight.

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[Jackpaul]

Minimal impact maybe 1-2mpgs…but they are going to seem huge compared to what you have now, true diameter will be around 33.75in for most 35’s installed.

 

[Chaos Theory]

I have 35/11.5 Ridge Grapplers. I can't attest to the MPG because I replaced OEM Falkens immediately, but I wanted to comment on 11.5 width: It's fine.

You'll notice a hit to your acceleration with 4.10 (I sure did), but as most would say, 4.10 is still within acceptable parameters.

 

[Gren71]

I went from 22 to 18 on the highway when I had 35s

unless you really need 35s, or are obsessed with the appearance, im happy I went back to a stock size.

no death wobble, no ball joint issues, no steering damper problems, ect. Ect. All of which follow folks who go the 35/37 route on this forum.

larger tires also negatively impact your towing ability so if you intend to use that max tow id think about it.

 

[ShadowsPapa]

Does anyone have actual change in MPG from switching to 35 x 11.5 tires.
I have a Sport S with Max Tow package- therefore wider axles and 4:10 gears.
I like my stock rims so was looking at Toyo Open County AT III because they are spec’d for 17x7.5 rims and have 50K warranty.
I know they maybe too Pizza Cutter for some but I think I will be OK with them.
I currently have the Dueler AT LT245/75R with a Tread width of 7.4”, 31.5 diameter and 42 lb weight.

Toyo 35x11.5
Tread width of 9”, 34.5 diameter and 62 lb weight.

So a 1.6” wider and therefore a little more rolling resistance and 20lb more weight.

Any answer will be pure speculation. All anyone can give is a possible range.

I went from 22 to 18 on the highway when I had 35s

unless you really need 35s, or are obsessed with the appearance, im happy I went back to a stock size.

no death wobble, no ball joint issues, no steering damper problems, ect. Ect. All of which follow folks who go the 35/37 route on this forum.

larger tires also negatively impact your towing ability so if you intend to use that max tow id think about it.

Exactly. Heck, I went down almost 2 mpg from the stock H/T tires the Overland comes with going to A/T tires that are the same diameter but wider.


A/Ts offer more rolling resistance than less aggressive tires, thus lower mpg
Heavier sidewalls can do similar.
Heavier tires matter for acceleration, mpg, etc.
Wider tires = drop in mpg all else being equal. (pay attention to the last 4 words before you jump all over that)
1.6 is a lot wider, therefore more than "a little more rolling resistance"
I went not even 1" wider and dropped mpg. You can count on it.

I'm in the "unless you need them" ...... camp.
Of course some will say "I need them to impress other Jeep people, and the ladies because I am not impressive by myself".

You will reduce towing capacity, reduce mpg, reduce acceleration and reduce braking ability with taller tires. Physics, math, geometry.

Face it - you will also change your driving habits with different tires because it will now "look more cool" to others.

Wind conditions will matter more with heavier, wider, taller tires.
Hills will matter more with heavier, wider, taller tires.
How you drive it will matter more.

 

[Jackpaul]

Any answer will be pure speculation. All anyone can give is a possible range.




Exactly. Heck, I went down almost 2 mpg from the stock H/T tires the Overland comes with going to A/T tires that are the same diameter but wider.


A/Ts offer more rolling resistance than less aggressive tires, thus lower mpg
Heavier sidewalls can do similar.
Heavier tires matter for acceleration, mpg, etc.
Wider tires = drop in mpg all else being equal. (pay attention to the last 4 words before you jump all over that)
1.6 is a lot wider, therefore more than "a little more rolling resistance"
I went not even 1" wider and dropped mpg. You can count on it.

I'm in the "unless you need them" ...... camp.
Of course some will say "I need them to impress other Jeep people, and the ladies because I am not impressive by myself".

You will reduce towing capacity, reduce mpg, reduce acceleration and reduce braking ability with taller tires. Physics, math, geometry.

Face it - you will also change your driving habits with different tires because it will now "look more cool" to others.

Wind conditions will matter more with heavier, wider, taller tires.
Hills will matter more with heavier, wider, taller tires.
How you drive it will matter more.

Good point, driving habits are probably the most overlooked aspect of tire size.

 

[FLGladiator]

larger tires also negatively impact your towing ability so if you intend to use that max tow id think about it.

Makes sense but also many buy the max tow for the purpose of not having to regear with 35s or 37s. I wanted the wider axles and 4.10s and likely will never tow.

 

[Barnaby’sdad]

I don’t really notice a difference to fuel economy (mine was shit to begin with), but you will definitely feel the acceleration difference, unless you’re not very observant.

My 315/70-17’s measure out at 33.5” under load, which…from the sounds of it….is in the ballpark of what you’re looking at.

Depending upon your setup, 4.10’s is fine to move them. I’ve got an Alu-Cab, a full-size/matching spare, ~100lbs of gear, and I’m a big boy. I routinely tow 2-3,000 lbs and it’s fine for that.

I won’t re-gear for now, but I’ll say that if I added anymore weight (I.e. Metal front bumper and winch), I’d likely look at stepping up to 4.88’s.

 

[okiesnake]

Minimal impact maybe 1-2mpgs…but they are going to seem huge compared to what you have now, true diameter will be around 33.75in for most 35’s installed.

 

[okiesnake]

Thanks!

 

[okiesnake]

Thanks everyone for all of your insightful input. Am I just suffering from tire size inadequacies! ?
I have been weighing out do I really want to give up MPG and possibly more important every day handling. Granted, no one buys a Gladiator for street performance but years of road course racing is hard to think about adding un-sprung weight!
I guess I need to get past that. It’s a Jeep!

 

[Gren71]

Thanks everyone for all of your insightful input. Am I just suffering from tire size inadequacies! ?
I have been weighing out do I really want to give up MPG and possibly more important every day handling. Granted, no one buys a Gladiator for street performance but years of road course racing is hard to think about adding un-sprung weight!
I guess I need to get past that. It’s a Jeep!

Youll realize how enjoyable and capable a stock JT is haha they’re way more than just big tires. ?

 

[Puch]

Does anyone have actual change in MPG from switching to 35 x 11.5 tires.
I have a Sport S with Max Tow package- therefore wider axles and 4:10 gears.
I like my stock rims so was looking at Toyo Open County AT III because they are spec’d for 17x7.5 rims and have 50K warranty.
I know they maybe too Pizza Cutter for some but I think I will be OK with them.
I currently have the Dueler AT LT245/75R with a Tread width of 7.4”, 31.5 diameter and 42 lb weight.

Toyo 35x11.5
Tread width of 9”, 34.5 diameter and 62 lb weight.

So a 1.6” wider and therefore a little more rolling resistance and 20lb more weight.

I have sport S MT with 4:10’s, Toyo AT2, 35 x 12.5.
Getting 16mpg on a good day.

 

[Blade1668]

I ran the stock A.T's then stock H.T's set #3 is aggressive A.T's but 33x10.5 with slight loss of mpg with the note of not recalibration of speedometer/ odometer. Tire pressure is also part of the equation too. (20 Sport S Max-Tow) I did find running the higher side for tire pressure 1. Better MPG's, 2. Better handling and less wandering. 3. The easy known fact. not the soft ride as stock tires and lower inflated tires. I could give you mileage stats that I've got but that would only be relevant for the driving style and locations that I do. I've had the high of 29 MPG's and averaging mid 25 MPG's then in the 13-16 MPG's (towing). Oddly the stock H.T's didn't get better MPG's than A.T's. I didn't correct the MPG's from the odometer but do have and keep a log. Stock tires it's slightly off on odometer more correct now with 33s and running around 48-51 psi tire pressure.

 

[okiesnake]

I have about 3,000 miles on the truck. I live in Oklahoma and there are some hills. Highway speed limits 75 here and I keep it at 75. Sometimes wind can be an issue. However, at 75 I never do better than 18.
In town, with patients, planning and timing of lights, I can average about 19.5 on a tank. I suppose I could deal with losing 2 MPG

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