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  #1  
Old 01-31-2011, 11:13 AM
Bobver Bobver is offline
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Angry Poor Gas Mileage

I purchased my 2000 XLT about 10 years ago with approx 12K miles on it. It now has approx 61k miles. Up until about a year ago the gas mileage was as expected for a truck; i.e. 16-18 city and 19-22 hwy. However, over the past year it seems to have gotten increasingly worst with city driving dropping to 10-12 MPG. The engine runs and idles fine with no noticeable loss of power. Any suggestions are greatly appreciated.
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  #2  
Old 01-31-2011, 11:29 AM
90fordranger 90fordranger is offline
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Default Re: Poor Gas Mileage

maybe, some sort of hole around your cat? I know when i had a hole between my cat and mufflar i lost a lot of power, and got worse mpg.
if there is a hole, you can simply go to autozone and get some mufflar tape, And cover the hole.
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  #3  
Old 01-31-2011, 11:46 AM
Bobver Bobver is offline
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Default Re: Poor Gas Mileage

Thanks 90fordranger. Although I don't notice any appreciable loss of power, I will look for that.
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  #4  
Old 02-02-2011, 11:12 PM
korins korins is offline
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Default Re: Poor Gas Mileage

What kind of plugs are you running? I've heard questionable spark plugs can suddenly lead to a dramatic mpg reduction...
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  #5  
Old 02-03-2011, 01:05 PM
wrench01 wrench01 is offline
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Default Re: Poor Gas Mileage

I have had the same thing happen to me and looking for a solution. I will also look for the hole near the CAT. Will let you know.
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  #6  
Old 02-03-2011, 01:18 PM
merlin215 merlin215 is offline
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Default Re: Poor Gas Mileage

FTYI

I have a 2010 and in the city , well it just drinks gas . 4.0 engine . On the highway every day I can get around 300 miles , give or take in perfect weather . But in the city it is bad .. Less than 250 miles per tank sometimes , stop & go etc .

Good thing : 18 gallons

Half as much as my Ram1500 was ( 26 gallons ) And I would get about the same per tank for more ....
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  #7  
Old 02-03-2011, 11:26 PM
joker515 joker515 is offline
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Default Re: Poor Gas Mileage

when is the last time you did a tune up?
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  #8  
Old 02-04-2011, 08:14 AM
Bobver Bobver is offline
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Default Re: Poor Gas Mileage

Good point about the tune-up. I've had the truck about 10 years and have never thought about a tune-up because it seem to be running so well. I'll give the tune-up a try. Thanks.
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  #9  
Old 02-07-2011, 04:30 PM
bassplyer92517 bassplyer92517 is offline
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Default Re: Poor Gas Mileage

There are so many things that could cause a loss of MPG, especially after such a long time without a tune-up. I did a tune-up on my old car I had, 94 mercury cougar, after 11 years of abuse and I went from 12 to 26 MPG highway. It all just adds up.
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  #10  
Old 04-05-2011, 09:51 AM
HTR HTR is offline
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Default Re: Poor Gas Mileage

I notice a differance in the grades of fuel on my older F150, How do the different grades affect the 3.0L Flex engines?
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  #11  
Old 04-05-2011, 10:13 AM
doyouquaxu doyouquaxu is offline
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Default Re: Poor Gas Mileage

i would check the fuel filter, MAF, and spark plugs. you might want to replace the fuel filter and spark plugs anyways, and clean the MAF/airfilter.
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  #12  
Old 04-05-2011, 06:47 PM
wangbungal wangbungal is offline
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Default Re: Poor Gas Mileage

do a tune up,wires spark plugs, carbon build could also cause it, fuel filter fuel cleaner seafoam maf sensor, egr intake throttle body, flush coolant change oil oil filter air filter change transmission oil
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  #13  
Old 04-08-2011, 10:35 AM
Tommy2 Tommy2 is offline
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Default Re: Poor Gas Mileage

DEFINITELY do a tune up if you haven't yet. If you've been driving the same car for a long time you may not even notice a gradual loss in power over time.

I bet when you give a tune up it's gonna feel like a different truck. Air filter, spark plugs, fuel injection cleaner. And eventually I'd do the tranny fluid/filter, fuel filter, coolant, etc..
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  #14  
Old 04-09-2011, 10:11 PM
knightmare1015 knightmare1015 is offline
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Default Re: Poor Gas Mileage

Quote:
Originally Posted by wangbungal View Post
do a tune up,wires spark plugs, carbon build could also cause it, fuel filter fuel cleaner seafoam maf sensor, egr intake throttle body, flush coolant change oil oil filter air filter change transmission oil
I did all of that and more and went from burning a 1/4 of a tank on a 20 mile trip back to where it was supposed to be. I'd also had the rear end flushed, the radiator also got flushed and I also had the tranny flushed out too and it made a world of difference in mine.
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  #15  
Old 04-10-2011, 07:27 PM
gocyclin gocyclin is offline
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Default Re: Poor Gas Mileage

Quote:
Originally Posted by knightmare1015 View Post
I did all of that and more and went from burning a 1/4 of a tank on a 20 mile trip back to where it was supposed to be. I'd also had the rear end flushed, the radiator also got flushed and I also had the tranny flushed out too and it made a world of difference in mine.
how much did that cost you total?
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