2003 ZTS - horrible gas mileage - 16.3mpg - HELP - Ford Focus Forum, Ford Focus ST Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace

Go Back   Ford Focus Forum, Ford Focus ST 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    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 08-28-2012, 01:54 PM   #1
Focus Enthusiast
Join Date: Nov 2011
Fan#: 91777
Location: Rockford, IL
What I Drive: 2003 Pitch Black ZTS Sedan

Posts: 217
Points 2,072, Level 27
Points: 2,072, Level: 27 Points: 2,072, Level: 27 Points: 2,072, Level: 27
Level Up 48% Completed
Level up: 48% Level up: 48% Level up: 48%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 1 PWGuy Good Standing Member
Buy-Sell-Trade Rating: (0)
Question 2003 ZTS - horrible gas mileage - 16.3mpg - HELP

I know this thread pops up ALOT around here but I am at a complete loss as to why I'm getting such horrific gas mileage (just filled up - 16.3mpg achieved in last tank) over the last couple months.

I got the car in November 2011 from my father-in-law. I think the mpg at that time was about 23-25 highway or so - definitely room for improvement. Oh, the car is running on stock rims with stock tire size but Blizzaks for tires as it is more of a winter car or for bopping around town. Last I checked the tire pressure was up pretty high - can't recall exact figure at the moment.

Since November 2011 I've replaced:

Fuel Filter (Motorcraft)
PCV Valve (Motorcraft)
PCV Hose Elbow (Motorcraft)
PCV Valve Hose - Exhaust (Motorcraft)
PCV Vavle Hose - Intake (Motorcraft)
Thermostat Housing and O-Ring (Motorcraft)
Thermostat (Motorcraft)
Valve Cover Gasket (Motorcraft)
Air box - mine was cracked (Motorcraft)
Air Filter - K&N
Upper/Front O2 Sensor (Motorcraft)
Spark Plugs (Motorcraft SP-478 - platinum)
Spark Plug Wires (Motorcraft WR-5974)

  • Cleaned the MAF a few months after installing the K&N
  • Replaced power steering fluid with ATF Mercon V (won't affect mpg)

  • Cleaning IAC to help with idle issues with A/C
  • Tranny fluid flush & filter change (won't affect mpg)
  • Seafoam
I'm not sure when the gas mileage began to drop from 23ish to 16 - maybe the last 3-4 months?

I'm not sure what else to do and am really frustrated.

PWGuy is offline  
    Reply With Quote

Bookmarks & Social Networks

Thread Tools
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

Forum Jump

All times are GMT -5. The time now is 04:00 PM.

Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Terms of Use : 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 Acura TLX or Fiesta ST. 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.