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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 05-16-2012
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Gas Mileage

Anyone else getting crappy gas mileage in their 2005 4.oL FX4? Plesae post MPG and if better than 12 highway let me know how I can boost mine.
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Old 05-17-2012
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Thats pretty bad. You should be around 18-19 if its a stock truck.

Do you have any check engine lights on? I would check air pressure, make sure your air filter is clean, replace the fuel filter, clean the MAF, and run synthetic oil.

Running a can of Seafoam might help some too.
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Old 05-17-2012
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Originally Posted by Lord Of War View Post
Thats pretty bad. You should be around 18-19 if its a stock truck.

Do you have any check engine lights on? I would check air pressure, make sure your air filter is clean, replace the fuel filter, clean the MAF, and run synthetic oil.

Running a can of Seafoam might help some too.
x2..... tune up time! Seafoam is a sure fire way to see all the gunk in the engine! I get about 12 city and about 17 highway in my 4.0....
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Old 05-17-2012
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Yea, that's pretty bad. 16.7 city, 20+ highway. Go into your profile and make a signature so we know what year you truck is and if anything has been done.
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Old 05-17-2012
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I have to agree that pretty bad. I get 16 city low 20's highway and thats on 32x11.5
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Old 05-17-2012
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That definitely sounds lows!

On a side note... how often are you guys using Seafoam?
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Old 05-17-2012
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I have only done it once, after I bought the truck earlier this year...I plan on an annual treatment.
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Old 05-17-2012
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I haven't made any mods just stock ranger 2005 4.0L Automatic. I can go through 1/4 tank of gas round trip to work it is about 46 miles round trip. If I keep it under 60mph I can make a tank last 5 days but it is runnjing on fumes on the trip home on the fifth day. New tires, front brakes, need oil change but thats it.
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Old 05-17-2012
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I've never done it but prob will when I hit 100.
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Old 05-17-2012
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hole in your gas tank?
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Old 05-17-2012
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Any mods to it?
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Old 05-20-2012
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wow.something is obvioulsy wrong...............I typically pull 20+ on the highway at 80mph
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Old 05-22-2012
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No holes in gas tank just cant figure it out. I have had tune ups fuel treatments oil changes and still i get shtity gas mileage. I dont even think that the sea foam in my tank is doing any good.
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Old 06-05-2012
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Originally Posted by vaquero View Post
No holes in gas tank just cant figure it out. I have had tune ups fuel treatments oil changes and still i get shtity gas mileage. I dont even think that the sea foam in my tank is doing any good.
What RPM's are you turning at 65 mph? Non-FX4 Rangers have 3.55 rear gears allowing 19-21 mpg on the hwy, but the FX4's have 4.10 rear gears. That type of gearing should be good for at least 16-17 on the hwy (especially with stock tires).

Last edited by borden123; 06-05-2012 at 04:27 PM.
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Old 06-05-2012
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I just got 21.95 MPG driving to Carlisle for the show--4.0 SOHC/Auto/4.10s/265-75R16s and a performance tune. Something about this combo on my truck just works at 70-75 MPH. I regularly get about 19 MPG driving a mix of city and highway at lower speeds.
Anyway--that's really low; time for plugs, wires, coil pack (maybe), fuel filter, Seafoam thru the vacuum line, check tire pressures, also make sure your brakes aren't dragging.
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Old 06-05-2012
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On a quarter tank, I go anywhere from 40-70 miles, and I get at or more then 20mpg most of the time. Are you calculating correctly? Starting with a fuel tank then at next fill up, Miles driven/fuel put in tank
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