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Old 11-11-2010, 06:07 AM
 
Location: Ohio
590 posts, read 931,463 times
Reputation: 416
Without any more information, it's a shot in the dark. It could be as easy as needing O2 sensor(s) or as complex as adjusting driving habit. 11.7 mpg is indeed very low; my 400-hp, 3,800-lb behemoth got almost 14 mpg with my lead foot (trying to pitch the car around corners don't help either), winter warm-up cycle, and very little highway driving .
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Old 11-11-2010, 07:39 AM
 
Location: Beaverton, OR
1,536 posts, read 1,495,102 times
Reputation: 647
As others have said, there's something definitely wrong there . Even my Grand Marquis with V8 engine gets 16 for purely city driving.
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Old 11-11-2010, 08:35 AM
 
11,067 posts, read 7,862,091 times
Reputation: 5423
Maybe one of your neighbors or co workers likes to syphon your gas.
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Old 11-11-2010, 09:36 AM
 
13,569 posts, read 16,485,105 times
Reputation: 11642
Quote:
Originally Posted by Cavaturaccioli View Post
I only get about 11.7 mpg around town. My mechanic says that's about par for what he says is just a thirsty car. The Ford web site says I should be getting more like 22 mpg. Anyone out there have an idea/suggestion? I only have around 31k miles on the car.
Well, a few things:

1. The quoted MPG ratings for that car use the old EPA standard. Real world numbers should be more in the 18-20 range for city driving.

2. Is the car throwing any codes aka is the check engine light on?

3. How did you determine the 11.7, through the information display or actually dividing miles driven from gallons used? You do that by topping off the tank and then driving for a while. Head back to the gas station and top it off. You then divide the miles driven by the gallons you pumped into the car. Try to go at least 100 miles to get an accurate reading.

3. What is your general driving habit? Do you idle the car a lot at stores and things?

4. In general the air filter, fuel filter and plugs are the things most likely to effect fuel mileage and not throw a CEL. Have any of these been replaced or checked?

5. That model year had a propensity for carbon build up on the throttle body and intake plenum. Have these been checked and cleaned?

6. The MAF sensor (located in the intake between the air filter and throttle body) can gather debris that will throw off the cars fule trims. Has this part been inspected and cleaned? If it was real bad it would trip a code, but can cause issues even if it isn't so bad to trip the CEL.

7. Is the car up to date on the latest ECM flashes? That model had several software revisions to the engine and transmission programming to improve performance and MPG. Take it to the dealer and ask them to check the ECM revision and flash to the new one if it is older.

8. Has this car ever had the camshaft synchronizer replaced? It was a common fail item on these cars. If it was not calibrated properly or is currently failing (bird chirp noise from engine, hesitation on acceleration) it can have a large impact on fuel economy.

9. Assuming your mechanic has a scan tool (NOT a code reader, a scan tool), he can hook it up to monitor the Long Term Fuel Trims (LTFT). This shows the fuel consumption on both banks of the car and should be checked at idle and also at a sustained 2,500 RPM. It can help identify if an issue exists.
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Old 11-11-2010, 02:33 PM
 
Location: The Pizzle, FLorida and Poconos in Pa
362 posts, read 86,193 times
Reputation: 235
Quote:
Originally Posted by Cavaturaccioli View Post
I only get about 11.7 mpg around town. My mechanic says that's about par for what he says is just a thirsty car. The Ford web site says I should be getting more like 22 mpg. Anyone out there have an idea/suggestion? I only have around 31k miles on the car.
It's a Ford. They're designed to pan out at the end of the warranty.

Last edited by bmwguydc; 11-12-2010 at 08:05 PM.. Reason: Inappropriate comment
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Old 11-11-2010, 02:59 PM
 
8,410 posts, read 8,543,131 times
Reputation: 6432
Quote:
Originally Posted by PeepoRsheep View Post
It's a Ford. They're designed to pan out at the end of the warranty. Sucker.
1995 F150-142K, still going strong.

1993 Lincoln Mark VIII-I drove it to 110K, sold it to a buddy who has over 200K now with nothing besides a water pump.

1987 Ranger V6-beat on it daily for 122K, sold it to a coworker who I KNOW never washed it, so maintenance is suspect. It wouldn't surprise me if it never saw new oil after I sold it. It finally croaked after 264K miles, a few months ago.

1983 Escort-abused daily until 90K miles, then sold to a roommate who drove it full time for Domino's. He sold it to another Domino's driver when he quit, with over 200K on it.

I have no problem with Fords.
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Old 11-11-2010, 03:15 PM
 
10,708 posts, read 8,554,541 times
Reputation: 3859
Quote:
Originally Posted by PeepoRsheep
It's a Ford.


Had two Taurus, both had over 250k and were still functional (engine wise) before I traded them in. Had an Explorer with over 200K before the engine decided it didnt want compression anymore. Had a Ranger with over 100k. Good truck but needed something better for my back. didn't like the newer F150 seats so it became a Chevy Avalanche (nice ride, but nickel and dimes me every few months).

Then I can go back many many years to the cars that died before ever hitting 100K. Impala, Delta 88, GTO, T37, malibu SS, 5th Ave, S10, Cady 4-6-8. Not a Ford in the bunch.
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Old 11-11-2010, 05:21 PM
 
Location: Eastern Washington
8,788 posts, read 22,248,809 times
Reputation: 4746
OP, do you have a Check Engine Light on? Check for codes, you should have at least one set.

You may have a fuel leak somewhere. Does not take much of a leak to kill MPG.

What about dragging brakes?

Possible explanation is you are making only very short trips, but even that should not have MPG down to what you are getting.
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Old 11-11-2010, 06:06 PM
 
Location: The Pizzle, FLorida and Poconos in Pa
362 posts, read 86,193 times
Reputation: 235
Quote:
Originally Posted by vmaxnc View Post
1995 F150-142K, still going strong.

1993 Lincoln Mark VIII-I drove it to 110K, sold it to a buddy who has over 200K now with nothing besides a water pump.

1987 Ranger V6-beat on it daily for 122K, sold it to a coworker who I KNOW never washed it, so maintenance is suspect. It wouldn't surprise me if it never saw new oil after I sold it. It finally croaked after 264K miles, a few months ago.

1983 Escort-abused daily until 90K miles, then sold to a roommate who drove it full time for Domino's. He sold it to another Domino's driver when he quit, with over 200K on it.

I have no problem with Fords.
Apparently the OP does and at 31k miles.
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Old 11-11-2010, 06:14 PM
 
Location: Brooklyn, NY
6,189 posts, read 2,995,562 times
Reputation: 6199
Thanks for all the great input (even the smartass ones.) i think this one's for the dealer. The fuel tank was replaced before I got it. Maybe the guy who put it in was hung over or something.
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