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  #1  
Old 11-28-2009, 11:28 AM
Superlifted06FX4 Superlifted06FX4 is offline
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Default 06 4.0 mileage issues

I drive an 06 FX4 with the 4.0SOHC, 5 speed auto, stock 4.10's. The only changes from stock are a T-bar crank, airbox mod, exhaust and 32x11.50's. I'm getting approx 14.04 mpg mix driving. I'm confused since it seems like I got the same mileage on my stock 31's. If someone else wants to do the calculations, be my guest. Trip odo says 229.1 miles and I put 16.312 gallons in. What am I doing wrong, it should be better, shouldn't it?
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torsion bar crank, 32x11.50R15's, DSG Alcoa's, S10 Blazer short OHC, black interior, Sonar projector headlights, taillight mod, Nightshades, hood/grille blackout, glasspack and resonator tip side exhaust, Xtang Blackmagic tonneau cover, THE original STX swap.
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  #2  
Old 11-28-2009, 11:34 AM
STL STL is offline
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is it all city, all highway or mixed

if it is mixed that is about what I get with mixed driving

Ever change your fuel filter?
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  #3  
Old 11-28-2009, 11:37 AM
Tom Tom is offline
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Quote:
Originally Posted by Superlifted06FX4 View Post
I drive an 06 FX4 with the 4.0SOHC, 5 speed auto, stock 4.10's. The only changes from stock are a T-bar crank, airbox mod, exhaust and 32x11.50's. I'm getting approx 14.04 mpg mix driving. I'm confused since it seems like I got the same mileage on my stock 31's. If someone else wants to do the calculations, be my guest. Trip odo says 229.1 miles and I put 16.312 gallons in. What am I doing wrong, it should be better, shouldn't it?
So you're getting the same mileage after your bigger tires and you think that's a problem?

16 MPG for a 4x4 4.0 w/ 32s sounds about right.
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  #4  
Old 11-28-2009, 12:13 PM
Jay FX4 Jay FX4 is offline
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Quote:
Originally Posted by Tom View Post
So you're getting the same mileage after your bigger tires and you think that's a problem?
That's what I was going to say. If anything, be happy that putting bigger tires on didn't make your MPG go down. Why would you think your mileage would improve?

Maybe if you did strictly highway driving, you'd see a small increase,
but if anything, getting the bigger diameter tires turning (not to mention the increased rolling resistance of increased width) usually makes MPG go down.
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  #5  
Old 11-28-2009, 12:58 PM
surfer03133 surfer03133 is offline
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did you recalibrate your speedo after getting bigger tires?
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  #6  
Old 11-28-2009, 01:03 PM
Fx4wannabe01 Fx4wannabe01 is offline
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That there trip odometer reading is probably off........


I saw my best numbers with the 4.10's and 32's. Of course I've got a 5spd manual...so idk if that makes a difference or not.






I like my 19mpg after a short road trip. hehe. Not bad for a big truck on 5's!
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  #7  
Old 11-28-2009, 02:09 PM
Superlifted06FX4 Superlifted06FX4 is offline
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Tell me how to get the filter off, I ain't seen this style connector before.
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torsion bar crank, 32x11.50R15's, DSG Alcoa's, S10 Blazer short OHC, black interior, Sonar projector headlights, taillight mod, Nightshades, hood/grille blackout, glasspack and resonator tip side exhaust, Xtang Blackmagic tonneau cover, THE original STX swap.
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  #8  
Old 11-28-2009, 02:10 PM
Superlifted06FX4 Superlifted06FX4 is offline
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Quote:
Originally Posted by STL View Post
is it all city, all highway or mixed

if it is mixed that is about what I get with mixed driving

Ever change your fuel filter?
Mixed. I expected a lil better, not much, but a lil.
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torsion bar crank, 32x11.50R15's, DSG Alcoa's, S10 Blazer short OHC, black interior, Sonar projector headlights, taillight mod, Nightshades, hood/grille blackout, glasspack and resonator tip side exhaust, Xtang Blackmagic tonneau cover, THE original STX swap.
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  #9  
Old 11-28-2009, 02:17 PM
DisturbedESV DisturbedESV is offline
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Are you accounting for the size difference in tires? I mean, my tires are 13% bigger than my stock ones so my odometer reads 13% lower than where it should...

Say your tires are 8% bigger than stock... you actually traveled 247.428 miles and that comes to 15.168 MPG. Also depends on how you drive. I have a 4.0 V6 4x4 5 Speed w/ 33s on 3.73 and I get about 16-17... that's anywhere from 50/50 city/freeway to 100% freeway... I don't ever break 18 anymore. Your engine is 2 years older than mine but I'm not really surprised at your mileage. Changing your driving habits might help but I think you're right where you should be...
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  #10  
Old 11-28-2009, 02:22 PM
surfer03133 surfer03133 is offline
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if you didnt recalibrate your odo after changing tires, you'll need to multiply the miles by 1.03257329, that'll give your exact miles. for 229.1 miles-- it would be 236.5 miles actual, not much but it improved your 14.04 mpg to 14.5 mpg.
^thats only if you did not redo your odo
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  #11  
Old 11-28-2009, 06:06 PM
Superlifted06FX4 Superlifted06FX4 is offline
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I had Ford reset it. And my truck only has 40k on it.
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2006 Ford Ranger FX4 Level II
torsion bar crank, 32x11.50R15's, DSG Alcoa's, S10 Blazer short OHC, black interior, Sonar projector headlights, taillight mod, Nightshades, hood/grille blackout, glasspack and resonator tip side exhaust, Xtang Blackmagic tonneau cover, THE original STX swap.
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  #12  
Old 12-03-2009, 01:32 AM
Superlifted06FX4 Superlifted06FX4 is offline
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Well this week I got 16.1 mpg after corrections. I still need to do the air filter and the fuel filter, and I already changed all the fluids except the oil, its not due yet. Tires are at 45 psi, and I doubt it needs plugs and wires at 40,000 miles.
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2006 Ford Ranger FX4 Level II
torsion bar crank, 32x11.50R15's, DSG Alcoa's, S10 Blazer short OHC, black interior, Sonar projector headlights, taillight mod, Nightshades, hood/grille blackout, glasspack and resonator tip side exhaust, Xtang Blackmagic tonneau cover, THE original STX swap.
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2013 Ford Focus SE
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  #13  
Old 12-03-2009, 07:30 AM
Jay FX4 Jay FX4 is offline
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What are you expectations?

While it is possible to get better mileage than that, 16 mpg is still better than it's EPA city rating.
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  #14  
Old 12-03-2009, 09:47 AM
RoadDawg RoadDawg is offline
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For the real deal on your calculations click on the link below and use the tire size calculator... Enter your original tire size into the field at the top and the new size into the field/s below... then click compare. The data will come back and it will tell you every thing you need about the variation in size measurements, speedometer difference, width/height and diameter difference etc...

BTW My mileage is running around 17-19 mpg over all combined average.

CLICK HERE > http://www.1010tires.com/tiresizecalculator.asp

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Last edited by RoadDawg; 12-03-2009 at 09:51 AM.
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  #15  
Old 12-03-2009, 09:54 AM
dixie_boysles dixie_boysles is offline
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going from 31 to 32s, would it change the speedo much? if so by how much?
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