('98-'00) New Tires=lowered fuel mileage? - Subaru Forester Owners Forum
Subaru Forester Forum
ebay search
Subaru Forester Forum
Go Back   Subaru Forester Owners Forum > Technical Forums and Vehicle Assistance > Tire and Wheel Tech
SubaruForester.org is the premier Subaru Forester Forum on the internet. Registered Users do not see the above ads.
User Tag List

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old 06-28-2013, 07:27 AM   #1 (permalink)
Forum Member
 
bamaforester's Avatar
 
Join Date: Jan 2012
Posts: 95
Location: daphne, alabama
Car Year: 99
Car Model: forester
Transmission: automatic
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Default New Tires=lowered fuel mileage?

Purchased a new set of OEM spec size tires. AND ponied up for the full "computerized laser beam 4 wheel top o the line alignment" my assumption was (since the car was badly out of align) and the tires where miss-matched crap, (p.o.'s fault not mine) my mileage would certainly improve after this.
Well, no. I am actually averaging about 4-5 mpg less on the highway than before
***?!?!!?

Has anyone else experienced this?
bamaforester is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 06-28-2013, 11:54 AM   #2 (permalink)
Forum Member
 
Join Date: Jul 2012
Posts: 635
Location: Ohio
Car Year: 2000
Car Model: Forester S
Transmission: AT
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Feedback Score: 1 reviews
Default

What tire/wear rating? Softer tires, etc all contribute to loss of MPG.


Do you have the alignment printout? Are we sure the alignment is good?
ADaughen is offline   Reply With Quote
Old 06-28-2013, 12:06 PM   #3 (permalink)
Super Moderator
Lifetime Supporting Member
 
crewzer's Avatar
 
Join Date: Apr 2009
Posts: 4,052
Location: Mills River, NC, USA
Car Year: 2012
Car Model: Forester X Prem AWP
Transmission: 5MT
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 1 reviews
Unhappy

In general, the switch to new tires can result in an initial reduction in fuel economy.

More info.

However, a 4-5 mpg loss is a bit much. Tell us more about the old- and new tires, including brands, models, and sizes.

Regards,
Jim / crewzer
__________________
12 Forester 2.5X FB25 5MT Premium AWP PZEV
09 Forester 2.5X EJ25 5MT Premium AWP PZEV (sold 7/2011)
crewzer is offline   Reply With Quote
Old 06-28-2013, 06:15 PM   #4 (permalink)
Forum Member
Lifetime Supporting Member
 
2.5x_sleeper's Avatar
 
Join Date: Aug 2007
Posts: 19,768
Location: Newberg, OR
Car Year: 2007
Car Model: Forester Sports XT
Transmission: 4EAT
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 42 Post(s)
Feedback Score: 39 reviews
Default

Could be as simple as under inflated tires. What size tires & what air pressure are you running?

Bobby...

['07 FSXT MODding Journal] ['03 X MODding Journal]
__________________
'07 FSXT - COBB Surgeline dyno Protune - Stage 1+
'03 X +AVO turbo kit = XT (son's)
'95 Neon Sport
2.5x_sleeper is online now   Reply With Quote
Old 06-28-2013, 07:06 PM   #5 (permalink)
On Island Time
Lifetime Supporting Member
 
North Ursalia's Avatar
 
Join Date: Apr 2013
Posts: 497
Location: Southern NH
Car Year: 2014
Car Model: Forester 2.5i Prem.
Transmission: 6MT
Gallery: 0
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 1 reviews
Default

The tread design has a lot to do with it as well- my Hakka snow tires with their blocky/chunky nature and numerous sipes offered up more rolling resistance than the Falkens I ran during the summer, though both were the same size and approximate weight.
North Ursalia is offline   Reply With Quote
Old 06-28-2013, 07:26 PM   #6 (permalink)
B&B
Forum Member
 
B&B's Avatar
 
Join Date: Mar 2012
Posts: 204
Location: Ottawa, ON
Car Year: 2011
Car Model: Touring
Transmission: 4EAT
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Default

Is it possible the previous tires were not OEM spec. I've seen it before on used cars.


Sent from AutoGuide.com Free App
B&B is offline   Reply With Quote
Old 06-29-2013, 07:33 AM   #7 (permalink)
adc
Forum Member
Contributing Member
Supporting Member
 
adc's Avatar
 
Join Date: Aug 2007
Posts: 10,726
Location: Elizabethtown, Pa.
Car Year: 2008
Car Model: 2.5X
Gallery: 100
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 112 Post(s)
Feedback Score: 0 reviews
Default

Quote:
Originally Posted by crewzer View Post
In general, the switch to new tires can result in an initial reduction in fuel economy.
However, a 4-5 mpg loss is a bit much
This has been my experience
__________________
Be careful what you wish for.
adc is online now   Reply With Quote
Old 07-10-2013, 04:00 PM   #8 (permalink)
Forum Member
Thread Starter
 
bamaforester's Avatar
 
Join Date: Jan 2012
Posts: 95
Location: daphne, alabama
Car Year: 99
Car Model: forester
Transmission: automatic
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Default

Both sets where 205/70/15 per the manual.
Old ones where 3 Firestones (down to the wear markers and 1 (really bald) michilin
I did receive a pre and post alignment print out
New tires are Sentinel UN99 all season tires
Tires are perfectly inflated.
bamaforester is offline   Reply With Quote
Old 07-10-2013, 06:32 PM   #9 (permalink)
B&B
Forum Member
 
B&B's Avatar
 
Join Date: Mar 2012
Posts: 204
Location: Ottawa, ON
Car Year: 2011
Car Model: Touring
Transmission: 4EAT
Gallery: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Feedback Score: 0 reviews
Default

The worn tires having a smaller diameter would tend to inflate the mileage reading, however not likely by 4 - 5 mpg.


Sent from AutoGuide.com Free App
B&B is offline   Reply With Quote
Old 07-10-2013, 09:16 PM   #10 (permalink)
Forum Member
 
Join Date: Mar 2010
Posts: 811
Location: Denver
Car Year: 2006
Car Model: XT Manual
Transmission: 5 speed
Gallery: 0
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Feedback Score: 0 reviews
Default

Bald tires grip less, roll easier, and get better gas mileage.
Your drop is extreme, add more air, screw any recommended pressure BS.
Next time, go skinnier, 195.
__________________
2006 XT Manual, Cobb Stage1, Conti 205/60-16
bashfulbernie is online now   Reply With Quote
Sponsored Links
Advertisement
 
Reply

  Subaru Forester Owners Forum > Technical Forums and Vehicle Assistance > Tire and Wheel Tech

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 04:56 PM.



Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Relevant URLs by vBSEO 3.6.0
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.