Poor gas mileage on 2004 ford focus with 72000 miles. new plugs oil. oil filter, air filter, tires are new. alignment is good. IAT sensor? MAF sensor? what can I do to get better mileage. I only get 200 miles from a full tank of gas on this pig. It idles a little high but other than that it runs great. Any suggestions? Thanks, Mike F.

You may have an oxygen sensor problem - check for error codes with a code scanner.

These maintenance intervals come from the maintenance interval calculator
at www.autozone.com, using a starting point of 25,800 miles (43000 km), and
assuming 1000 miles (1666 km) driven per month, and "severe driving conditions," which
are actually normal usage characteristics, such as frequent short trips, urban driving, waiting in traffic, driving in hot weather, trips under 16 km in cold weather, etc.

STARTING MILEAGE: 25800 (43,000 Kilometers)
Item
Action
Service History

20000 miles or 32000 kilometers

Battery Check
Oil Filter, Engine Replace
Engine Oil Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Tires Rotate


21000 miles or 33600 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


24000 miles or 38400 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


25000 miles or 40000 kilometers

Battery Check
Oil Filter, Engine Replace
Engine Oil Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Tires Rotate


27000 miles or 43200 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


30000 miles or 48000 kilometers

Battery Check
Air Filter Element Check
Wheel Bearing Lubricate
Steering and Suspension Lubricate
Fuel Filter Replace
Oil Filter, Engine Replace
Engine Oil Replace
Fluid - A/T Replace
Cabin Air Filter Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Cooling System Inspect
Wheel Bearing Inspect
Ball Joint Inspect
Drive/Propeller Shaft Inspect
Exhaust System Inspect
Steering and Suspension Inspect
Heat Shield, Exhaust Inspect
Tires Rotate


33000 miles or 52800 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


35000 miles or 56000 kilometers

Battery Check
Oil Filter, Engine Replace
Engine Oil Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Tires Rotate


36000 miles or 57600 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


39000 miles or 62400 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


40000 miles or 64000 kilometers

Battery Check
Oil Filter, Engine Replace
Engine Oil Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Tires Rotate



42000 miles or 67200 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


45000 miles or 72000 kilometers

Battery Check
Steering and Suspension Lubricate
Fuel Filter Replace
Oil Filter, Engine Replace
Engine Oil Replace
Cabin Air Filter Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Cooling System Inspect
Wheel Bearing Inspect
Ball Joint Inspect
Drive/Propeller Shaft Inspect
Steering and Suspension Inspect
Tires Rotate


48000 miles or 76800 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


50000 miles or 80000 kilometers

Battery Check
Oil Filter, Engine Replace
Engine Oil Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Tires Rotate


51000 miles or 81600 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


54000 miles or 86400 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


55000 miles or 88000 kilometers

Battery Check
Oil Filter, Engine Replace
Engine Oil Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Tires Rotate


57000 miles or 91200 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


60000 miles or 96000 kilometers

Battery Check
Air Filter Element Check
Wheel Bearing Lubricate
Steering and Suspension Lubricate
Fuel Filter Replace
Spark Plug Replace
Fluid Filter - A/T Replace
Oil Filter, Engine Replace
Engine Oil Replace
Fluid - A/T Replace
Cabin Air Filter Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Cooling System Inspect
Wheel Bearing Inspect
Ball Joint Inspect
Drive/Propeller Shaft Inspect
Exhaust System Inspect
Steering and Suspension Inspect
Heat Shield, Exhaust Inspect
Tires Rotate


63000 miles or 100800 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


65000 miles or 104000 kilometers

Battery Check
Oil Filter, Engine Replace
Engine Oil Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Tires Rotate


66000 miles or 105600 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


69000 miles or 110400 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


70000 miles or 112000 kilometers

Battery Check
Oil Filter, Engine Replace
Engine Oil Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Tires Rotate


72000 miles or 115200 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


75000 miles or 120000 kilometers

Battery Check
Air Filter Element Check
Steering and Suspension Lubricate
Fuel Filter Replace
Oil Filter, Engine Replace
Engine Oil Replace
Cabin Air Filter Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Cooling System Inspect
Wheel Bearing Inspect
Ball Joint Inspect
Drive/Propeller Shaft Inspect
Steering and Suspension Inspect
Tires Rotate


78000 miles or 124800 kilometers

Steering and Suspension Lubricate
Oil Filter, Engine Replace
Engine Oil Replace


80000 miles or 128000 kilometers

Battery Check
Oil Filter, Engine Replace
Engine Oil Replace
Vehicle Inspect
Brakes and Traction Control Inspect
Tires Rotate



And you can continue the pattern from there...

CODE PO170 - FUEL TRIM BANK 1 MALFUNCTION. POSSIBLE CAUSES TO YOUR PROBLEM. AIR LEAKS IN THE INTAKE MANIFOLD. EXHAUST PIPES OR EXHAUST MANIFOLD. FUEL CONTROL SENSOR IS OUT OF CALIBRATION ECT IAT MAF. LOW FUEL PUMP PRESSURE FUEL FILTER CLOGGED FUEL PRESSURE REGULATOR FAULTY. ONE OR MORE INJECTORS RESTRICTED OR FUEL PRESSURE REGULATOR FAILED. HO2S ELEMENT IS CONTAMINATED DETERIORATED OR HAS FAILED.LOOK FOR VACUUM HOSE DISCONNECTED BROKEN LEAKING OR LOOSE.CHECK THE MASS AIR FLOW SENSOR SIGNAL CIRCUIT. SHOULD BE 4.8 - 5.2 VOLTS.IF SIGNAL CIRCUIT LOWER VOLTS LOOK FOR SHORT TO GROUND OR AN OPEN HIGH RESISTANCE IN CIRCUIT.IF YOU ARE 12 VOLTS FROM SIGNAL CIRCUIT PCM IS FAULTY.BEFORE SPENDING A LOT OF MONEY TAKE VECHICLE TO GARAGE OR DEALERSHIP.LET THEM TEST IAT AND MASS AIR FLOW SENSOR PARAMETER FOR THE CORRECT RANGE OR HZ USING A VARIABLE SIGNAL GENERATOR TO SEE IF IAT MAF SENSOR GOOD OR PCM FAULTY. THIS WAY YOU WONT SPEND TOO MUCH MONEY.

P0113 indicates the IAT Intake Temperature Sensor has a problem.
P0303 indicates a misfire on cylinder 3

I believe the IAT is built into the MAF sensor located in the air snorkle and helps regulate the air/fuel mixture. Also concentrate on cylinder 3 looking for problems such as injector, wiring, etc.

Hope this helps!

Audie

maf sensor located between the air filter and air intake manifold

It could be 2 things. The grade of gas you're using and / or your style of driving. Bump up to the next level of gas and don't put your foot into it as much. Get off the gas earlier when coming to a stop. I have a full size SUV and I average 24 MPG city.

Tune Time.
1)new spark plugs properly gapped.
2)new air filter (check every 35000 miles)
3)new fuel filter (every 35000 miles)
4)1 bottle of STP fuel treatment (red bottle) 4x a year.
5) oil and filter change (castrol or another good quality oil every 3-4000 miles.
6)proper air pressure in tires (check every 2 months
7) service transmission every 40000 miles or less.

New oil and filter
8) new plug wires every 80000 miles.

You could fill the tires with Nitrogen but it will cost about $15 a tire. You will gain 1.5 - 2 miles more a gallon. Big trucks were made for pulling and hualing only. If your looking at gas mileage then you need a focus.

Thats the mass air flow meter.Should get changed at 60.000 miles. Also change the air filter.

when was the last time you put in fuel injector cleaner? I put in Lucas Oil Injector cleaner every other or every oil change.

There are alot of factors affecting your gas mileage. Tire wear, tire pressure, wheel alignment, air filter, fuel filter, spark plugs, oxygen sensors, just to name a few. So to say what you need is just shooting in the dark without more information. I would probably start with your oxygen sensors, and then perform a tuneup. If your vehicle pulls to one side or the other when driving on the highway you need to stop into the shop for a wheel alignment.