I consistantly pull 25-30 mpg. How is your maintenance schedule?

 

i get 25 in my svt

 

26-28 mixed driving.
37 highway best(windows up a/c on).

 

Obviously something is wrong. It looks like my mileage is off by about 30%. I change the oil every 3000 and keep clean air and oil filters installed. It starts up quick. Runs great, but slurps gas. I wonder if the fuel regulator is screwy. Anybody ever have one go bad?

 

could be an o2 sensor stuck in open loop, have you ever changed the 02 sensors?

 

i get the same gas millage so i wanna know what i can do to get it better

 

Short city trips with the AC on will give you low mpg........

 

i filled my car up till the nozzle stopped, and then went 10 miles up highway 50 and came back to the same gas station and put exactly a gallon in at 20 miles on the trip odometer and i wasnt running the a/c when i did thatb

 

ive been getting real crappy gas mileage ever since i got my fuel pump changed. best ive gotten since getting it changed is 26 mpg all highway. im around 22 city. im going to check my o2 sensor this weekend. change the oil this weekend. and hope that it does better

 

There is no way to "check" a o2 sensor with out a scan tool to see what the trims are showing

Find a local FF member that has a xcal scan tool and see whats going on there are a lot of sensors that would cause low MPG

Tom

 

ya, you'll have to datalog for the o2, see if the voltage for the o2 is just steady. if it doesn't change, the 02 is bad.

 

could i do it with a volt meter???????

 

you'd have to splice off the wires, but ya, i think you could

 

i will jus poke a little hole in each wire and tape over them when i am done, now i have to go repo my volt meter from my friend lol

 

got the same problem...
my check engine is on, so i checked the code and the o2 sensor is bad...
gonna replace it and i hope that helps a little...
the air filter is clean, change oil every 3000 miles with full synthetic same with ngk spark plugs... and the sensor is the only thing that i could think of...

 

^full synthetic won't help gas mileage.

Ngk spark plugs are not a good choice. Either Autolite or whatever ford recommends (does motorcraft make plugs?)

The o2 sensor will fix most if not all of your mileage problem.

Matt
Posted via FF Mobile

 

Please elaborate as to how NGK spark plugs "are not a good choice"....

 

Sure synthetic oils are better for MPG

If you check the o2 with a volt meter you have to know what your looking for , you should see the voltage switch up and down but only after about 3-4 min of idling then depending on what that voltage is you could be running lean or rich and that would mean you have other issues , Its best to get a scan tool

Focusfanatics is the LARGEST Focus community on the web you should be able to find a member with a Predator or xcal to use to datalog

Tom

 

Xcal scan tool? I got to google that to see what it is.

 

SCT is the company that makes the X-calibrater for our focus. It can scan codes and reset them . It will also show live data on a lap top. You can also buy custom tunes. Download them from Tom (1turbofocus) over the internet. Very good tool to own. Every Focus owner should have it. Most of the time it will save you $$ , it keeps you from guessing at problems.

 

it could be something that is added to the gas in order to stop it from freezing, i see you live in maryland so this could be the case, my other suggestion is going to oreilly's or any other automotive store and buy a fuel additive, should only be a few bucks, and it will help to relubricate your pistons and clean your engine

 

you mentioned air and oil filters, have you done the fuel filter yet?

 

I have same problem max 25 on long run. Took it to Autozone and they told me catalytic converter had gone, cost about $300 plus fitting