Lost 8MPG with New Tires! - Page 2 - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus Tech Discussions > Wheels & Tires - Sponsored By Tire Rack

Wheels & Tires - Sponsored By Tire Rack The place to go for answers on wheel types, tire sizes, offset, wheel patterns and more.
Sponsored By:
Tire Rack


Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Reply
 
Thread Tools Display Modes
Old 09-23-2012, 05:45 PM   #11
emsvitil
Focus Addict
 
Join Date: Sep 2007
Fan#: 50210
Location: SoCal, CA
What I Drive: 2000 SE Wagon

Posts: 1,264
Points 3,003, Level 33
Points: 3,003, Level: 33 Points: 3,003, Level: 33 Points: 3,003, Level: 33
Level Up 69% Completed
Level up: 69% Level up: 69% Level up: 69%
Forum Activity 2%
Activity: 2% Activity: 2% Activity: 2%
FF Reputation: 9 emsvitil Good Standing Member
Buy-Sell-Trade Rating: (0)
Air pressure too low

Directional tires mounted backwards (don't think it would affect mileage, but maybe)

Alignment (new tires have squirmier tread blocks, which may be more rolling resistance with an alignment problem)
__________________
Ed
emsvitil is offline  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 09-23-2012, 10:57 PM   #12
aarfocus
Focus Rookie
 
Join Date: Sep 2012
Fan#: 104128
Location: Travelers Rest, SC
What I Drive: 2009,Blue,SE

Posts: 5
FF Reputation: 1 aarfocus Good Standing Member
Buy-Sell-Trade Rating: (0)
Good replies!

Thanks to all for the replies and help! I am planning to do some experimentation this week, probably leading to having the TPMS sensors installed in the new tires eventually.

Just to cover some things mentioned:

Pressure: Actually raised it to 35psig in the new tires to see if I could improve the MPG-no significant change.

Alignment: New alignment with new wheels/tires, plus a recheck-no change.

Direction: New tires are directional-proper direction.

Weight: Possible increase, I will check. (doubt this would have much effect, especially "over the road", once up to speed the effects are minimal.)

Driving style: Again possible, but the "OTR" (highway) numbers are mostly with cruise on and it still goes down. When I first noticed the reduction, I figured that it was my being more agressive, but after a couple of thousand miles, I know it isn't.

More later!
Thanks,
Ned
aarfocus is offline  
    Reply With Quote Quick reply to this message
Old 09-24-2012, 01:49 PM   #13
elsolo
Focus Fanatic
 
elsolo's Avatar
 
Join Date: Mar 2012
Fan#: 96835
Location: Long Beach, CA
What I Drive: 2003 dark shadow grey metallic ZX3

Posts: 2,338
Points 2,526, Level 30
Points: 2,526, Level: 30 Points: 2,526, Level: 30 Points: 2,526, Level: 30
Level Up 51% Completed
Level up: 51% Level up: 51% Level up: 51%
Forum Activity 12%
Activity: 12% Activity: 12% Activity: 12%
FF Reputation: 17 elsolo Great Standing Member
Buy-Sell-Trade Rating: (1)
I lost 1-2 mpg when I went from 205/55/16 to 215/45/17.
Same brand and type of tires.

It was worse at first, but not 8 mpg worse, I attributed it to more aggressive driving style with the new wheels and tires.
elsolo is online now  
    Reply With Quote Quick reply to this message
Old 09-24-2012, 02:27 PM   #14
BigRed03
( o Y o )
 
BigRed03's Avatar
 
Join Date: Feb 2006
Fan#: 32177
Location: Ft. Laudy, Afghanistan
What I Drive: 2003 CD Silver ZX5 SVT

Posts: 5,549
FF Reputation: 9 BigRed03 Good Standing Member
Buy-Sell-Trade Rating: (4)
tire width and tire compound can have serious influences on mpgs. i consistently get 2-3 mpgs less highway with my z rated tires (<30k miles) than friends with 60k+ mile rated tires, and i drive at slower speeds (~77 vs ~80)
__________________
BigRed03 is offline  
    Reply With Quote Quick reply to this message
Old 09-24-2012, 02:32 PM   #15
iminhell
C2H5OH
 
iminhell's Avatar
 
Join Date: Jun 2006
Fan#: 36222
Location: Darwin, MN
What I Drive: 2000 & 2001 ZX3's

Posts: 10,715
Points 18,426, Level 86
Points: 18,426, Level: 86 Points: 18,426, Level: 86 Points: 18,426, Level: 86
Level Up 16% Completed
Level up: 16% Level up: 16% Level up: 16%
Forum Activity 7%
Activity: 7% Activity: 7% Activity: 7%
FF Reputation: 49 iminhell Great Standing Member
Buy-Sell-Trade Rating: (4)
I'm going with weight and diameter.

Diameter will alter the calculation for MPG. OP really hasn't said much about the new tires/wheels so I can't offer much in the way of how much error.
Thought I'd made a thread discussing tire diameter errors, but I can't find it.

Rotating weight is always in play, even at sustained speeds. It takes more power to keep it at speed.
__________________
Don't "think outside the box".
There is no box.
Do it correct, or do it twice.
iminhell is offline  
    Reply With Quote Quick reply to this message
Old 09-24-2012, 03:19 PM   #16
Malibooya
Quarter Tank Racer
 
Malibooya's Avatar
 
Join Date: Aug 2009
Fan#: 68054
Location: NYC, NY
What I Drive: 2003 Pitch Black ZX3

Posts: 2,116
Points 3,364, Level 36
Points: 3,364, Level: 36 Points: 3,364, Level: 36 Points: 3,364, Level: 36
Level Up 10% Completed
Level up: 10% Level up: 10% Level up: 10%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 7 Malibooya Good Standing Member
Buy-Sell-Trade Rating: (1)
Quote:
Originally Posted by iminhell View Post

Rotating weight is always in play, even at sustained speeds. It takes more power to keep it at speed.
This was my thought too. How much do the 17s weigh?
__________________
Quote:
Originally Posted by LouBomb
Omaha is worthless besides the World Series of College Baseball and horny white girls that for some odd reason find me attractive.
Malibooya is offline  
    Reply With Quote Quick reply to this message
Old 09-26-2012, 11:20 PM   #17
Slo86GT
Focus Addict
 
Slo86GT's Avatar
 
Join Date: Aug 2011
Fan#: 88885
Location: Hockley, TX
What I Drive: 2013 Sterling Gray Focus SE

Posts: 857
Points 3,119, Level 34
Points: 3,119, Level: 34 Points: 3,119, Level: 34 Points: 3,119, Level: 34
Level Up 46% Completed
Level up: 46% Level up: 46% Level up: 46%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 2 Slo86GT Good Standing Member
Buy-Sell-Trade Rating: (1)
I went from stock sized 2008 SES snowflake wheels with 205/50/16 Yokohama S-Drive's and got about 32-33 mph with pretty passive driving.

Now, no matter how gramps I drive my car with the 6 spoke 2004 SVT wheels and 215/45/17 Kuhmo's I CANNOT get over 30 mpg on the exact same trips.

I'm a bit aggravated and thinking of getting an intake/tune to help with this a bit. :-\

...It's worth it, though. The car looks 100x better on the new wheels.

http://i178.photobucket.com/albums/w...s/e5d304e0.jpg
__________________
2013 Focus SE 5M Daily Driver
2003 Mustang GT V8/Auto Wife's Daily
1986 Mustang GT V8/5M Toy
- Jody -
Slo86GT is offline  
    Reply With Quote Quick reply to this message
Old 10-08-2012, 08:29 PM   #18
elsolo
Focus Fanatic
 
elsolo's Avatar
 
Join Date: Mar 2012
Fan#: 96835
Location: Long Beach, CA
What I Drive: 2003 dark shadow grey metallic ZX3

Posts: 2,338
Points 2,526, Level 30
Points: 2,526, Level: 30 Points: 2,526, Level: 30 Points: 2,526, Level: 30
Level Up 51% Completed
Level up: 51% Level up: 51% Level up: 51%
Forum Activity 12%
Activity: 12% Activity: 12% Activity: 12%
FF Reputation: 17 elsolo Great Standing Member
Buy-Sell-Trade Rating: (1)
I just did another 2000 mile roadtrip, this time with svt 17" wheels and 215's.
Mileage is the same if driving with cruise control compared to the 205's on 16"
elsolo is online now  
    Reply With Quote Quick reply to this message
Old 10-12-2012, 11:42 PM   #19
Phokus
Shiny Metal Titanium
 
Phokus's Avatar
 
Join Date: Nov 2008
Fan#: 60433
Location: Quincy, MA
What I Drive: 2013 Performance Blue Titanium Seda

Posts: 3,647
Points 12,531, Level 73
Points: 12,531, Level: 73 Points: 12,531, Level: 73 Points: 12,531, Level: 73
Level Up 21% Completed
Level up: 21% Level up: 21% Level up: 21%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 7 Phokus Good Standing Member
Buy-Sell-Trade Rating: (9)
Most likely the wheel weight man.
I went from 15" stockers to 17" 15 spoke stockers and 17" motegi 5 spokes I lost a handful of mpg I could never regain at least not very easily.
I never weighed them to compare but it was noticeably heavier when I was picking up the wheels to bolt on. I lost about 5-9mpg by going to 17s but oh well.. you gotta pay to play. lol

However, Since my Ti I just got is starting with 18s I wonder what I'll gain from going to 15s in the winter.
__________________
1965 Mustang Coupe 289 4spd
2003 Land Rover Discovery II SE
2013 Lincoln MKZ Hybrid
Phokus is online now  
    Reply With Quote Quick reply to this message
Old 10-13-2012, 09:39 PM   #20
lilpup2022
Focus Enthusiast
 
Join Date: Feb 2006
Fan#: 31757
Location: Garland, TX, TX
What I Drive: 2012, sterling grey, sel sedan

Posts: 73
FF Reputation: 1 lilpup2022 Good Standing Member
Buy-Sell-Trade Rating: (0)
if you increased the rolling diameter of the tire you will lose mpg. also the tire can change mpg all by its self without even changing the size. I work with tires and have seen it a million times. a hybrid will come in getting 40= mpg and not want to pay for the tires designed for eco cars and want a cheaper tire. well that cheaper tire doesnt have the same rolling resistance and weights several pounds more than the eco tire. i personally switched my stock tires (continental) for a bridgestone turanza with serenity plus which is a low rolling resistance eco tire. i average 41.8 mpg on the hwy now.
__________________
Insert smartass comment here!
lilpup2022 is offline  
    Reply With Quote Quick reply to this message
Reply

Bookmarks & Social Networks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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

Forum Jump


All times are GMT -5. The time now is 04:06 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat