My MPG lowered. Want help to fix - 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 First Generation > DURATEC Performance (2003-2007)

DURATEC Performance (2003-2007) The place to chat about any Duratec 23, 23E, and 20 engine performance, tuning and exhaust related upgrades.

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

Reply
 
Thread Tools Display Modes
Old 02-12-2014, 07:06 AM   #1
jwindbigler
Focus Enthusiast
 
Join Date: Feb 2014
Fan#: 139441
Location: Detroit, MI
What I Drive: 2007 Maroon Focus

Posts: 84
FF Reputation: 1 jwindbigler Good Standing Member
Buy-Sell-Trade Rating: (0)
My MPG lowered. Want help to fix

I track my MPG on a websit called fuelly.com. Specifically:

http://www.fuelly.com/driver/jwindbigler/focus

I have recently done some upgrades, and have seen about a 4mpg decrease in fuel efficiency.

Recent upgrades:
STEEDA CAI
Strut bar
17" wheels with 215/45R17

Now Im certain that its because Im running wider snow tires on a bigger wheel. The wheels are about an inch taller (with tire) than my stock 16s. But I dont want to go with a smaller sidewall (due to detroit potholes, and already cracking one of the wheels). I would return to stock however, the added stability with the tires is something I dont want to give up.

The wheels dont seem to be throwing my speedometer off, but since they are an inch taller, would this make a difference in what im seeing in my mpg tracking?

If anyone knows how to get my mpgs back up into the 30s with the mods I have, I would greatly appreciate it.


jwindbigler is offline  
    Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 02-12-2014, 09:25 AM   #2
rambleon84
So mote be it
 
rambleon84's Avatar
 
Join Date: Nov 2007
Fan#: 51521
Location: columbus, OH
What I Drive: 2007 Dark Toreador Red ZX3

Posts: 5,526
Points 7,594, Level 58
Points: 7,594, Level: 58 Points: 7,594, Level: 58 Points: 7,594, Level: 58
Level Up 22% Completed
Level up: 22% Level up: 22% Level up: 22%
Forum Activity 11%
Activity: 11% Activity: 11% Activity: 11%
FF Reputation: 23 rambleon84 Great Standing Member
Buy-Sell-Trade Rating: (15)
Are the 17's you bought heavier than your 16s? Usually going bigger moves more of the unsprung weight to the outside of the wheel/tire and that will cause an mpg decrease. I noticed a couple mpg loss when going from oem 15"s to SVT 17's.

Have your driving habbits changed at since installing the Steeda short ram? As in, are you enjoying the new sound and getting on the gas more often? That would cause some of a drop too.

Also, 215.45/17 is an oem Focus size..,they shouldnt be an inch taller than 205/55-16's
rambleon84 is online now  
    Reply With Quote Quick reply to this message
Old 02-12-2014, 10:08 AM   #3
crice8
Focus Fanatic
 
crice8's Avatar
 
Join Date: Apr 2011
Fan#: 84830
Location: tyler, TX
What I Drive: 2010 Sterling Gray Focus SE Sedan

Posts: 3,392
Points 8,390, Level 61
Points: 8,390, Level: 61 Points: 8,390, Level: 61 Points: 8,390, Level: 61
Level Up 80% Completed
Level up: 80% Level up: 80% Level up: 80%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 9 crice8 Good Standing Member
Buy-Sell-Trade Rating: (13)
Quote:
Originally Posted by rambleon84 View Post
Are the 17's you bought heavier than your 16s? Usually going bigger moves more of the unsprung weight to the outside of the wheel/tire and that will cause an mpg decrease. I noticed a couple mpg loss when going from oem 15"s to SVT 17's.

Have your driving habbits changed at since installing the Steeda short ram? As in, are you enjoying the new sound and getting on the gas more often? That would cause some of a drop too.

Also, 215.45/17 is an oem Focus size..,they shouldnt be an inch taller than 205/55-16's
This is exactly what I was going to type lol
__________________
Galatians 6:14
crice8 is offline  
    Reply With Quote Quick reply to this message
Old 02-12-2014, 12:23 PM   #4
jwindbigler
Focus Enthusiast
 
Join Date: Feb 2014
Fan#: 139441
Location: Detroit, MI
What I Drive: 2007 Maroon Focus

Posts: 84
FF Reputation: 1 jwindbigler Good Standing Member
Buy-Sell-Trade Rating: (0)
Even though I do like the new sound of the intake, I have kept my foot out of it. I recently did a freeway trip to Grand Rapids. About a 300 mile round trip, and normally I would get about 30-32mpg, and this last time I got 26.

The wheels I got seem to be of similar weight to that of my OEM wheel tire combo. Yet, I feel that the engine is working too hard to push the 215s, and thats what is causing my mpg decrease.

I have another set of 17" wheels for the summer time, and was considering running a 205/45R17. Would that help with my mpg a little bit?
jwindbigler is offline  
    Reply With Quote Quick reply to this message
Old 02-12-2014, 12:48 PM   #5
SlickWilly
Focus Fanatic
 
SlickWilly's Avatar
 
Join Date: Jul 2013
Fan#: 116476
Location: Orlando, FL
What I Drive: 2009 Ford Focus SES Sangria Red

Posts: 2,067
Points 4,524, Level 42
Points: 4,524, Level: 42 Points: 4,524, Level: 42 Points: 4,524, Level: 42
Level Up 87% Completed
Level up: 87% Level up: 87% Level up: 87%
Forum Activity 23%
Activity: 23% Activity: 23% Activity: 23%
FF Reputation: 6 SlickWilly Good Standing Member
Buy-Sell-Trade Rating: (1)
Weight of the wheels will decrease mileage in a hurry. Intakes are exactly a mileage increaser either.
__________________
K&N Intake - Magnaflow Exhaust - F2 Header - CFM Race Pulleys - VF Engineering Mounts - N2O
SlickWilly is online now  
    Reply With Quote Quick reply to this message
Old 02-12-2014, 03:20 PM   #6
crice8
Focus Fanatic
 
crice8's Avatar
 
Join Date: Apr 2011
Fan#: 84830
Location: tyler, TX
What I Drive: 2010 Sterling Gray Focus SE Sedan

Posts: 3,392
Points 8,390, Level 61
Points: 8,390, Level: 61 Points: 8,390, Level: 61 Points: 8,390, Level: 61
Level Up 80% Completed
Level up: 80% Level up: 80% Level up: 80%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 9 crice8 Good Standing Member
Buy-Sell-Trade Rating: (13)
Quote:
Originally Posted by SlickWilly View Post
Weight of the wheels will decrease mileage in a hurry. Intakes are exactly a mileage increaser either.
An intake will increase your mpg if you maintain the same driving habits as before. increased efficiency = more mpgs
__________________
Galatians 6:14
crice8 is offline  
    Reply With Quote Quick reply to this message
Old 02-12-2014, 03:24 PM   #7
crice8
Focus Fanatic
 
crice8's Avatar
 
Join Date: Apr 2011
Fan#: 84830
Location: tyler, TX
What I Drive: 2010 Sterling Gray Focus SE Sedan

Posts: 3,392
Points 8,390, Level 61
Points: 8,390, Level: 61 Points: 8,390, Level: 61 Points: 8,390, Level: 61
Level Up 80% Completed
Level up: 80% Level up: 80% Level up: 80%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 9 crice8 Good Standing Member
Buy-Sell-Trade Rating: (13)
Which wheels did you have on it before the 17"? I honestly believe the decrease your seeing is because the increased weight in wheels. Someone with a second gen went from the oem 15" wheels to the ses 17" wheels a couple of years ago and saw a 4-5mpg decrease. Where increase wheel weight really knocks the mpgs is in town or stop and go driving. It now takes additional force to get them rolling than before.
__________________
Galatians 6:14
crice8 is offline  
    Reply With Quote Quick reply to this message
Old 02-12-2014, 03:48 PM   #8
mikeb0916
Focus Enthusiast
 
mikeb0916's Avatar
 
Join Date: Jul 2011
Fan#: 87595
Location: Orlando, FL
What I Drive: 03 Twilight Blue ZX3 PWSC & 14 500

Posts: 68
Points 1,770, Level 24
Points: 1,770, Level: 24 Points: 1,770, Level: 24 Points: 1,770, Level: 24
Level Up 70% Completed
Level up: 70% Level up: 70% Level up: 70%
Forum Activity 7%
Activity: 7% Activity: 7% Activity: 7%
FF Reputation: 2 mikeb0916 Good Standing Member
Buy-Sell-Trade Rating: (4)
When I went from the stock 15" wheels to the 17" eaps on my zx3, I noticed an immediate 3mpg drop from 30 to 27. Part of the price to play the game. It's now worse since I'm boosted and have issues with right foot control lol.
__________________
2003 Twilight Blue ZX3
Powerworks BBK, Quaife, Spec stg. 2+, Fidanza, and more...
2014 Nero Puro Fiat 500 Abarth
Stock-ish...
mikeb0916 is online now  
    Reply With Quote Quick reply to this message
Old 02-12-2014, 03:59 PM   #9
Driven5
Focus Enthusiast
 
Join Date: Mar 2012
Fan#: 95835
Location: Seattle, WA
What I Drive: Building a Duratec powered Locost.

Posts: 83
Points 51, Level 1
Points: 51, Level: 1 Points: 51, Level: 1 Points: 51, Level: 1
Level Up 2% Completed
Level up: 2% Level up: 2% Level up: 2%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 1 Driven5 Good Standing Member
Buy-Sell-Trade Rating: (0)
There are simply too many variables, all of which are likely contributing factors to at least some degree or another:

Stock sizes in 2007 were 195/60-15 (~24.2" OD) and 205/50-16 (~24.1" OD). This is what the cars odometer is calibrated around. A 215/45-17 has a ~24.6" OD. This will reduce the accuracy of your odometer, and thus your calculations. It can also affect driving style due to the effect of taller gearing on acceleration. Granted, in this case it's not a huge difference either though at ~2%.

Driving style changes due to effective gearing change and modifications.

Winter weather.

Higher rolling resistance tires.

Wider tires.

Potentially, but not necessarily, heavier wheel/tire package.

In my experience, unless it's drastically different from stock, the weight and width play a relatively minor role...Especially on the highway, where you specifically note the problem to exist. Snow tires do have a rather high rolling resistance though, a sacrifice you make in exchange for having a car on the road rather than in a ditch. You may also think you're staying out of it, but even minor increases driving enthusiasm can have surprisingly detrimental fuel economy effects. It's far easier to decrease your fuel economy, than it is to increase it.

But in looking at your fuelly data, I would be inclined to believe that the biggest culprit is simply the winter weather. Your 1 year fuel economy graph looks suspiciously like it's following the temperature trends. Over the years I've noticed that all of my fuel efficient daily drivers have averaged 3-5mpg worse in the winter than the summer.
__________________
-Justin

You can follow my Duratec powered 'Locost' build at:
GarageOdyssey.blogspot.com
GarageOdyssey.tumblr.com

Last edited by Driven5; 02-12-2014 at 06:07 PM.
Driven5 is offline  
    Reply With Quote Quick reply to this message
Old 02-12-2014, 04:22 PM   #10
crice8
Focus Fanatic
 
crice8's Avatar
 
Join Date: Apr 2011
Fan#: 84830
Location: tyler, TX
What I Drive: 2010 Sterling Gray Focus SE Sedan

Posts: 3,392
Points 8,390, Level 61
Points: 8,390, Level: 61 Points: 8,390, Level: 61 Points: 8,390, Level: 61
Level Up 80% Completed
Level up: 80% Level up: 80% Level up: 80%
Forum Activity 1%
Activity: 1% Activity: 1% Activity: 1%
FF Reputation: 9 crice8 Good Standing Member
Buy-Sell-Trade Rating: (13)
Quote:
Originally Posted by Driven5 View Post
There are simply too many variables, all of which are likely contributing factors to at least some degree or another:

Stock sizes in 2007 were 195/60-15 (~24.2" OD) and 205/50-16 (~24.1" OD). This is what the cars odometer is calibrated around. A 215/45-17 has a ~24.6" OD. This will reduce the accuracy of your odometer, and thus your calculations. It can also affect driving style due to the effect of taller gearing on acceleration. Granted, in this case it's not a huge difference either though.

Driving style changes due to effective gearing change and modifications.

Winter weather.

Higher rolling resistance tires.

Wider tires.

Potentially, but not necessarily, heavier wheel/tire package.

In my experience, unless it's drastically different from stock, the weight and width play a relatively minor role...Especially on the highway, where you specifically note the problem to exist. Snow tires do have a rather high rolling resistance though, a sacrifice you make in exchange for having a car on the road rather than in a ditch. You may also think you're staying out of it, but even minor increases driving enthusiasm can have surprisingly detrimental fuel economy effects. It's far easier to decrease your fuel economy, than it is to increase it.

But in looking at your fuelly data, I would be inclined to believe that the biggest culprit is simply the winter weather. Your 1 year fuel economy graph looks suspiciously like it's following the temperature trends. Over the years I've noticed that all of my fuel efficient daily drivers have averaged 3-5mpg worse in the winter than the summer.
Good Info Here^
__________________
Galatians 6:14
crice8 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 12:09 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