2003 ZTS - horrible gas mileage - 16.3mpg - HELP - 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 > General Technical Chat

General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Search This Forum | Image Search | Advanced Search    
FocusFanatics Merchandise

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 10-02-2012, 04:01 PM   #11
Focus Enthusiast
Join Date: Nov 2011
Fan#: 91777
Location: Belvidere, IL
What I Drive: 2003 Pitch Black ZTS Sedan

Posts: 217
Points 2,131, Level 27
Points: 2,131, Level: 27 Points: 2,131, Level: 27 Points: 2,131, Level: 27
Level Up 88% Completed
Level up: 88% Level up: 88% Level up: 88%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 1 PWGuy Good Standing Member
Buy-Sell-Trade Rating: (0)
Originally Posted by IH84DZ View Post
I see a lot of variables in here that don't make your mileage figures a shocker. Unless you are calculating fuel economy by filling your tank, logging mileage and filling the tank at the same pump again while dividing the miles driven by gallons used - your fuel usage figures are terribly inaccurate. This may sound unacceptable given you are using the fuel gauge but if you understood how a fuel gauge worked it would make more sense. They are accurate estimations of fuel level, not accurate measurents of fuel level.

A drive of less than 3 miles (especially in cool temps) is likely not enough time for the engine to reach closed loop. In open loop it fuels the engine based on a programmed table that is certainly rich of stoich and thus it will consume more fuel in open loop than it will in closed loop. This is aside from all the other problems you can expect with such a short run cycle.

Your tire compound will negatively affect fuel economy as well because they have more drag compared to a street tire - regardless of how much air you put in them

It is a good idea to check for dragging brakes - especially if you've had brake issues in the past

How much extra weight is in the car?

What is the ethanol content of the fuel being used?

Your woman may have poor driving habits. I can make a motorcycle get 10mpg if I try hard enough........

Get rid of the K&N filter. MAF based Fords are notorious for aftermarket filters (especially "performance" filters that use oil to trap FOD) messing with the air turbulence across the MAF sensor and/or contaminating the sensor with oil. Comparing what mileage you get with a go-fast air filter to what others get with paper filters isn't a very valid comparison.
0 extra weight in the car - back seats and trunk are EMPTY.

Regarding the short trip to work - should I let the car warm up? And for the record, I drive my Mazda Miata about the same mileage to the health club every other day and that is IT (I work from home). And I STILL GET 24-25 MPG! What the hell gives here with the Focus!? And the Miata is older - 1997!

You've summarized things well and I will take your advice tonight and get a new air filter, and sell the stupid K&N. I've been wondering if I simply drank the kool-aid on that one without thinking it through/researching.

The gasoline I purchase is local Mobil or BP - so whatever their standard is for ethanol content?
PWGuy is offline  
    Reply With Quote

Bookmarks & Social Networks

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


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 02:59 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