Gas Mileage Problems
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Joined: Aug 2011
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Gas Mileage Problems
I have a 2005 F150, 1/2 ton, 2WD, 4.2L EFI 6-cyclinder and the gas mileage on my truck has gone from 19mpg city to 10mpg city. I have replaced plugs and EGR Valve. Truck runs well just uses lots of fuel. No idea where to go from here other than a shop. Some history on truck. No problems with mileage until I had to take the truck to the local Ford dealer due to a recall on a spring in the steering column that could possibly make the air bag activate. Approximately one week later my engine light came on and it tested as needed a new EGR valve. Back to the Ford dealer, EGR replaced and now my gas mileage is crap. Getting scared of Ford dealers. HAHAHA!
Last edited by homart58; Aug 16, 2011 at 12:39 AM. Reason: More information given
Post Fiend
Joined: Feb 2009
Posts: 8,005
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From: Ottawa, Ontario
Wow.... my '89 F150 4.9L inline 6, 3 speed auto gets 12 in town, and 18 highway (driving 55mph). lol 20+ years later and only HP improved
Postmaster
Joined: Jul 2010
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From: Henrico, VA
John your 89 engine is a inline 6 his is a 5.4 V-8 so the fact that you only average 1 mph better is nothing because he has more power and the same mileage basically. I average about 14-15 but I have a light foot and tend to let me truck coast more it all depends on the traffic you are in and your driving habits mostly.
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From: Saraland AL
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Elder User
Joined: Nov 2006
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From: Iowa
I average 13 in city with just a bit of highway miles.
Have the 5.4 and it is going in for a fuel filter and spark plug change next week.
Have the 5.4 and it is going in for a fuel filter and spark plug change next week.
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For the tank of fuel I bought in July, I got 12.1 mpg just driving short distances around my town with the A/C running full blast. If the typical drive for you is 6 miles out & back, 10 mpg is not that surprising. For most of August 2011 I have been able to drive my truck with the A/C off & have taken a couple of 20 & 30 miles round trips - my mileage jumped to 16.1 mpg, much more typical. I have been carefully filling my tank & keeping track of gas mileage ever since I bought my F150 in 2002.
Tuned
Joined: Dec 2004
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From: SoCal
My most recent mileage was 20.1mpg - 4.2L V6, automatic. Lowest I can remember is 16mpg once, 17-18 normally, with regular AC usage. LA freeways with occasional stop and go traffic.
That much of a change does not sound right, but the change in your commute sounds like a big factor.
That much of a change does not sound right, but the change in your commute sounds like a big factor.
Posting Guru
Joined: Jul 2005
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From: San Jose, CA
Have you changed fuel brands? I get the best results using Shell or Chevron.
Are those hand-calculated mpg's? 19 city seems above average. I get 14mpg around town and can push 18mpg tops on the freeway going 65-70mph. When my wife drives her 2mile commute to work with her notoriously heavy foot on either pedal, she's lucky to check in with 12-13mpg city.
I keep rpms no higher than about 2K while accelerating unless I'm passing some moron. I see her routinely up at 2400-2500rpms--that guzzles fuel like watering my lawn.
Are those hand-calculated mpg's? 19 city seems above average. I get 14mpg around town and can push 18mpg tops on the freeway going 65-70mph. When my wife drives her 2mile commute to work with her notoriously heavy foot on either pedal, she's lucky to check in with 12-13mpg city.
I keep rpms no higher than about 2K while accelerating unless I'm passing some moron. I see her routinely up at 2400-2500rpms--that guzzles fuel like watering my lawn.
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repman17
1987 - 1996 F150 & Larger F-Series Trucks
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Aug 11, 2007 08:09 PM
