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Old 12-15-2009, 21:40   #1 (permalink)
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confused 2009 f-150 5.4 fuel milage

i have an 09 f-150 5.4l and when i bought it i was getting great fuel milage around 20mpg now all im getting is 12 to 14mpg wondering if any one else has had the same problem
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Old 12-18-2009, 23:50   #2 (permalink)
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Re: 2009 f-150 5.4 fuel milage

You need to run Error code scans. A common occurrence is the ECT sensor (cheap part) goes bad and the engine does not enter "Closed loop function". It stays in over rich warm up mode, w/o the benefit of ECM Air/Fuel Trim. The CEL stays off because it's not in "CLF".
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Old 12-30-2009, 18:26   #3 (permalink)
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Re: 2009 f-150 5.4 fuel milage

i had it at the dealer and they said there was no dtc codes on it
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Old 01-02-2010, 07:16   #4 (permalink)
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Re: 2009 f-150 5.4 fuel milage

Depending on where you live, winter might have some effect on this. Colder start up temps, winter fuel (additives to help start the engine in colder weather aren't good for fuel economy). Has your driving style changed? With it being an '09 did you baby it for the first while and are now, even slightly, more aggressive with the throttle? Are your tire pressures good? have you carried any passengers around town lately, or something else that will add weight to the vehicle? Do you idle the vehicle to warm it up? Or do you just get in, start it, and drive away? Even short idling spurts can drown mileage numbers.

On a side note, my 4900lb Durango R/T AWD with the 5.9L engine gets 13.5mpg in mostly city driving. Pure city driving (absolutely no highway) in winter I'm lucky to see 12mpg. I didn't buy it for the fuel economy.

Longer oil change intervals mean less maintenance over time, but in my area, heavily salted roads = lots'o dust, and it can clog an air filter in less than couple weeks of daily driving.
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Old 02-08-2010, 20:16   #5 (permalink)
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Re: 2009 f-150 5.4 fuel milage

I was wondering the same thing but then i pulled out the big blue price sheet that used to be on the window and 14-15 is stated on the sheet :(

I would recommend accelerating a bit slower and you might see a big improvement. when i do the speed limit all the time my gas mileage is amazing but I can't pass up beating other pickups off the line. :)
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