Once the ecu relearns everything your gas milage will get better then.

 

yep, was going to say the same thing. give it a week. i forget how long it takes, but if things aren't looking better within a few tanks and a few hundred miles, then complain, lol.

 

did u check the connections on the gas line for the fuel filter

i changed mine and the connections werent too go so i got new clips and then it didnt matter

 

have you cleaned your air filter in a while? just a thought

you from horseheads, ny?

 

its okay here im california gas is like 350 so ur not paying that much, but it still sucks to fill up that often .

 

See if computer fixes it, if not change the air filter. Also check the tire pressure, ive noticed on mine when it leaks some air out the gas mileage goes out the window.

 

It's the crappy arse weather that's killing the gas mileage.

 

yea the airfilter is close to hitting its lifespan according to the textbook but its still in good condition. I'm going to have to replace it soon.

Yea horseheads ny, where u live?

 

i used to live about 3 hours from horseheads been there many times

 

nice! great place huh?? lol

and yes the connections are good from the filter, i made sure of it

 

well replace the air filter, dont wait till its gone, and see if that helps are the spark plugs gapped correctly?

 

Is your Focus a auto by any chance????

 

i was gonna suggest checkin the gap on the plugs too..

 

Personally I think you need to clean you mass air flow sensor. Your car is having a hard time making a fuel map. It should learn it in 7 miles, so there is no reason that it should take a tank or two to see a increase. Get MAF cleaner, for 5 bucks it worth a try

 

Wrong.....

it takes about 150 miles of driving BEFORE the ECU starts making changes.

 

Just stating what the ford tech told me when I was having fuel mapping issues. I figured I could take his word for it. Still sounds like a dirty MAF.

 

Nobody's asked this yet, but what type of plugs did you throw in the car?

 

my focus is standard

The plugs i bought are..Autolite double platinum. When i bought the car used the previous owner had the same plugs. I dont know if those are stock or not.

I have to take apart my CAI this weekend so i'll be sure to get some cleaner

 

I would check out your sparkplug wires while you're at it, too.

 

yea i need to pick some up, maybe i'll post a thread in the WTB section

 

maybe change your driving habits?

 

i dont drive like mr honda-man down the street. Only time the pedal hits the floor is when i'm passing someone on the highway. I drive especially cautious this time of year anyways with the snow and ice as the lovely ny weather

 

I want to update on what i've done... I bought a bottle of fuel system cleaner, bottle of MAF sensor cleaner, took out the CAI and switched it with a short ram, and got a new air filter.

Car runs a ton better and i can tell i'm getting better mpg. I really think it was the dirty MAF. thanks focus_SWT for the recommendation

 

If you switched from a CAI to the short ram, this can improve MPG because you're sucking in warmer air, which will vaporize the gas better.

 

No problem, Any kind of oiled filter results in this. But I like oiled filters... Just clean it ever time you clean and oil the filter. I do mine every 2 months... On my F350 dually the Explorer and the Focus....

And it makes a diff. on all of them

 

Where do you get 3.30 a gallon?? I'm paying nearly 3.75!!!

 

Will keep that on the to do list for regular maintenance.

Gas is now $3.40 in upstate ny. CA gas is over the top

 

> you're sucking in warmer air, which will vaporize the gas better.

I'd double-check that bit of information if I were you.