Help | Advanced Search | Contact Us | Link to Us | Members | Calendar
Welcome Guest ( Log In | Register )


                                        
 
Reply to this topicStart new topic
> Tire Size Vs Gas Mileage
Cheatham
post Jan 2 2008, 12:22 AM
Post #1


Newbie


Group: Members
Posts: 2
Joined: 2-January 08
Member No.: 8,410
Drives: 1998 Toyota T100 4x4 3.4L manual
Location: USA



I have a 1998 Toyota T100 4wd with 265/70R16 tire size. My current mileage is in the high teens mpg with I hear is average. Most of my mileage is 65-75 mph on the highway/state roads. Realizing there's a large number of variables that can affect mpg, I'm considering reducing the tire size to 235-255 width/65-70R16 tire in hopes to improve the mpg. The side effects I can think of are fast speedometer, lower truck height, greater suspension wear, better handing and braking(assuming traction), and higher engine rpm. I can accept all of these with better mileage. Anyone have advice or experience on whether this action would improve my mileage or have other consequences? FYI - I've found a great resource at http://www.csgnetwork.com/tireinfo4calc.html which gives detailed differences in tires sizes. Thanks.
Go to the top of the page
 
+ Quote Post
LotOMiles
post Mar 13 2008, 09:57 PM
Post #2


Full Member
**

Group: Members
Posts: 276
Joined: 22-September 07
Member No.: 6,761
Drives: 93 Pickup
Location: USA



I might be mistaken, but the 4wd versions came with higher gearing. It's true that putting smaller tire on will help the MPH as the less weight spinning the better, but it also puts the engine into a higher RPM and that eats more gas.
Only someone who has do thing or is really good with math can answer the question.

It's sort of a toss up. I put lighter street tires of the same size on mine. It helped a few MPG over the knobbies.
Go to the top of the page
 
+ Quote Post
MickeyFouse
post Feb 16 2009, 07:35 PM
Post #3


Member
*

Group: Members
Posts: 49
Joined: 6-February 09
Member No.: 16,068
Drives: 2000 Corolla
Location: CA



From a mechanical perspective, an increase of tire/rim diameter might effect the efficiency of the transfer of energy or torque upon the axle. However, I would speculate that the change would be negligible.

In summary, I would suspect that the change in tire size would have minimal effect on your "actual mileage", but the "measured mileage" could easily vary as a result of calibration issues.
___________________
replacement car parts
Go to the top of the page
 
+ Quote Post
fourwd1
post Mar 6 2009, 02:50 PM
Post #4


Full Member
**

Group: Members
Posts: 238
Joined: 10-January 08
Member No.: 8,585
Drives: 84 4Runner rockcrawler
Location: central MD



QUOTE (LotOMiles @ Mar 13 2008, 10:57 PM) *
I might be mistaken, but the 4wd versions came with higher gearing.


4WD's come with lower gearing, but lower gearing is expressed by a higher number, which leads to confusion.

A 2WD can have a 3.90 ratio while a 4WD has a 4.10 ratio. The 4.10 is lower gearing than 3.90.
Go to the top of the page
 
+ Quote Post
  Advanced Search

Start new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:





ToyotaFans.Net is unofficial Toyota forum and not affiliated with or endorsed by Toyota Motor Sales.