Nissan Frontier Forum banner
1 - 16 of 16 Posts

·
Registered
Joined
·
2,591 Posts
Discussion Starter · #1 ·
My experiance from switch from stock size wheel, with stock rim

and switching to a larger size of 285/75/16 Kumho MT.


From...



To....




I was avraging about 18.4 mpg with the stock size tires, and over the last 3 tanks of fuel (with 285/75/16) I have been getting about 17.2.

So Only a lose of 1.2 MPG. Just any FYI if any one is on the fence about going bigger.
 

·
Registered
Joined
·
872 Posts
Have you been driving the same roads with the same driving habits? If so that's pretty good results from not only the size increase but also the fact you're going from an A/S to an M/T.
 

·
Registered
Joined
·
17,538 Posts
i average about .5 less mpg with my 32" TG's vs the 31" long trails that were on it originally... i'm probably going back to a 31" LTX next if i can swing it when it's time...
 

·
Registered
Joined
·
2,591 Posts
Discussion Starter · #6 ·
Have you been driving the same roads with the same driving habits? If so that's pretty good results from not only the size increase but also the fact you're going from an A/S to an M/T.
Yes. Exactly same road, route, and driveing habbits. Good question. I should havementioned that.

Are yall accounting for the false odometer reading after switching to a larger tire?
Ya know I was wondering that. I have not to answer you. So if any think my MPG should be even better because I am travling further then what the OD says.


So this is my thinking....

the stock size tire is a 31 inch.

Take 31 x 3.14 = 97.34 So for every tire rotaton I travle 97.34 inches

Take 33 x 3.14 = 103.62 So for every tire rotaton I travle 103.62 inches


The % diffrence between the two numbers is... 7% (97.34 divided by 103.62 = .93,) So the 31 inch tire is 93% the size of the 33 inch tire, a diffrence of 7%.

So I should take my milage and add 7% to it, due to the computor doesnt know about the extra tire size.... so my mileage really is...

330 miles to a tank of fuel (19 gal)
X 7%
23.1


23.1 added to my total miles per tank
+330
353.1


353.1 Total miles per tank
/ 19.0 Gals of fuel
18.58 MPG!



So my milage went up slightly!!!!!!!!!!!!!


Can someone check my math? Sounds to good to be true!

Thanks
 

·
Registered
Joined
·
2,928 Posts
i average about .5 less mpg with my 32" TG's vs the 31" long trails that were on it originally... i'm probably going back to a 31" LTX next if i can swing it when it's time...

x2....same size TGs
 

·
Registered
Joined
·
2,340 Posts
I averaged about 1.4mpg hit too.
 

·
Premium Member
Joined
·
1,782 Posts
Jordo: You're pretty close, it's 6% difference.

PD = (x1 - x2)/[(x1 + x2)/2] x 100%

PD = (33 - 31)[(33+31)/2] x 100%

PD = 2/32 x 100% = 6.25%

330 x .0625 = 20.625 + 330 = 350.625/19gal = 18.454mpg.

But, the stock speedometer (odometer too) is also off about 3% to the fast side from the factory (and even that is not 100% true across the board), so you're only really off about 4%. 18mpg flat is a pretty decent estimation.
 

·
Registered
Joined
·
2,591 Posts
Discussion Starter · #11 ·
Jordo: You're pretty close, it's 6% difference.

PD = (x1 - x2)/[(x1 + x2)/2] x 100%

PD = (33 - 31)[(33+31)/2] x 100%

PD = 2/32 x 100% = 6.25%

330 x .0625 = 20.625 + 330 = 350.625/19gal = 18.454mpg.

But, the stock speedometer (odometer too) is also off about 3% to the fast side from the factory (and even that is not 100% true across the board), so you're only really off about 4%. 18mpg flat is a pretty decent estimation.


^^^^^^ Good info right there!!! ^^^^^^^^
 

·
Registered
Joined
·
1,821 Posts
You'll need to really put some miles on them to be able to know the true difference. I've got 33k miles on my Kumhos and I lost a solid 1.5mpg difference between stock Nismo tires and these tires.
 

·
Registered
Joined
·
2,591 Posts
Discussion Starter · #13 · (Edited)
You'll need to really put some miles on them to be able to know the true difference. I've got 33k miles on my Kumhos and I lost a solid 1.5mpg difference between stock Nismo tires and these tires.
Thats about right. I noticed about a 1.2 MPG drop. So that puts us at a .03 MPG diffrence. And I def drive like grandmal to get the most $ out of my fuel. Plus driving slow is benificial to everyone else.... So they can look at my truck!!!:) J/K, J/K!!! Serioulsy tho, I do try and show it off like that!

I got problems, I know. My doctor said this is as good as I get, so... :)
 

·
Registered
Joined
·
3,538 Posts
You'll need to really put some miles on them to be able to know the true difference. I've got 33k miles on my Kumhos and I lost a solid 1.5mpg difference between stock Nismo tires and these tires.
I have 32k on mine and only lost 1mpg on 33x12.5x18s and im 15.2lbs heavier per tire 60.8lbs total
 

·
Registered
Joined
·
431 Posts
thats not bad I think i get like 15mpg on my 285s. ofcourse i usually have a good 500lbs. in the bed.
 

·
Registered
Joined
·
1,115 Posts
yeah I definately lost 1.5-2mpg with the lift and the 33's... And thats taking into account the 6% difference...
 
1 - 16 of 16 Posts
Top