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  #21  
Old 05-16-2012, 11:26 AM
sourbeer sourbeer is offline
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Default tire size

I used an SCT livewire tuner with custom tunes and it did have the tire size setting in the tuner. It was a 2010 Ford F350 6.4L diesel and was a monster. My odometer still was off. The fuel calculator was WAY off with the tune.

I'm also wondering, if you change your gearing, tire size etc... how far off is your fuel calculator that you are showing in your picture. I can't imagine that is accurate. I have a hard time believing that you can get 14-15 mpg with a lifted truck with 37" tires when my factory truck with 32" tires and 3.92 gears is getting on average 15. It is new and I know mileage will get a little better, along with driving style for some but I think there is somehting off with the mileage calculation. I would love to think that I could add big tires and not hurt my actual mileage that much, but realistically I think I am looking at a couple mpg atleast by going to 35-12.50 tires.
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  #22  
Old 05-16-2012, 12:07 PM
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candy08 candy08 is offline
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Quote:
Originally Posted by sourbeer View Post
I used an SCT livewire tuner with custom tunes and it did have the tire size setting in the tuner. It was a 2010 Ford F350 6.4L diesel and was a monster. My odometer still was off. The fuel calculator was WAY off with the tune.

I'm also wondering, if you change your gearing, tire size etc... how far off is your fuel calculator that you are showing in your picture. I can't imagine that is accurate. I have a hard time believing that you can get 14-15 mpg with a lifted truck with 37" tires when my factory truck with 32" tires and 3.92 gears is getting on average 15. It is new and I know mileage will get a little better, along with driving style for some but I think there is somehting off with the mileage calculation. I would love to think that I could add big tires and not hurt my actual mileage that much, but realistically I think I am looking at a couple mpg atleast by going to 35-12.50 tires.
Not sure why you would think the od and gas mpg would be off. You correct it by changing the tire size with a either a tuner or in my case a Hypertech Speedometer/odmeter calibrator. This technology has been out for a while....kinda blows my mind you couldnt change it on a 2010 Ferd. Sounds like you had a case of operator error

That hypertech corrected my speedo/odo for the tire change and also changed my programming for my 4.56 gears. for the shift patterns and what not. So yes EVERYTHING is correct and have even verified by GPS and done mpg hand calculations....

You will lose a couple mpg with stock gears and going to 35s for sure. With 35s you're geffective ratio will be about 3.55 with heavy ass tires. With my 4.56s my gearing is still quite a bit lower than yours in stock form, I'm right below 4.10s with the 37s. My in town mpg is a beast, however hwy is my worst bc of the rpms I run going 70-75mph.

You really dont have to belive me, Im pretty sure my picture is enough proof.
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Last edited by candy08; 05-16-2012 at 12:10 PM.
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  #23  
Old 05-16-2012, 05:12 PM
sourbeer sourbeer is offline
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Default sounds good for sure.

i did not mean for it to be taken that I thought you were lying. I was in disbelief that the mileage could be so good with such big heavy tires, regardless of gearing.

my issues could have very well been operator error. i adjusted the tire sizes with the programmer many times, along with transmission shifting, and such. I did not mess with it so much as to try to calibrate the odometer with the GPS as it wouldn't have mattered to my on board fuel caculator anyhow.

I'm not likely to go bigger than 35's and hope that my mileage is as good as some of you folks get.
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  #24  
Old 05-16-2012, 06:37 PM
Raynval Raynval is offline
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Default Mpg

I have a RC 5" lift with 35" toyo MT tires. I lost 2-3 MPG and now get between 9-11 depending on where/how I'm driving (I don't drive fast). When I pull my small loaded Toyhauler, I lose about another 3-4 MPG!. Mine is a 3/4 ton Crew 4x4 with a full bed and 3.73 gears, so it'll get about 1-2 MPG worse than most 4x4 1500s. My odo was set as high as it could be by the dealer (33" tires, since thats what comes on the Powerwagon). I manually calculated it once, and to my surprise, the onboard computer was almost exactly the same.

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Old 05-17-2012, 01:46 AM
YoungGun YoungGun is offline
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Quote:
Originally Posted by Ace-- View Post
I hear you, im new to the truck world as well (I grew up with them my whole life) but first owned truck! What I did was browse and browse over and over through the forums and found ALOT of information. You'd look into a 4.10 gear ratio or even 4.56 (If you plan on going bigger tires in the future). It is a decent chunk of money but I hear Its 100% worth it.. I'll be getting mine done here soon just saving my pennies.. Its more expensive for 4wd than 2wd keep that in mind but im assuming you got a 4wd

Thought OP was worried about fuel mpg? The steeper gears will only decrease fuel mileage.
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  #26  
Old 05-17-2012, 09:47 AM
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Hemi1536 Hemi1536 is offline
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Quote:
Originally Posted by candy08 View Post
I have 10" lift and 37s with 4.56s....I usually avg 13ish-15ish, all depending on how I drive. Granted this is all 50/50 city/hwy driving and hwy kills my mpg. I havent got below 13ish since I got the gears. Also everytime I get in the truck I kill TC and put it in 5th. Just took this on the way to work, probably one of my better tanks....
FYI buddy with 6' and 37" Toyos and 3.92s stays 9-10mpg

Speaking of gas, looks you could use a little Candy..
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  #27  
Old 05-18-2012, 12:51 AM
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My 2010 4x4 hemi quad cab stock tire size before I added a leveling kit was 16-17 average. When I added Bilsteins in the front to level it I dropped to 14-15. Changed my oil to Synthetic and it pushed me up to 15-16. Closer to 16 most of the time. 50% city, 50% freeway.
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  #28  
Old 05-19-2012, 01:57 AM
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BradZ BradZ is offline
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I'm gonna call my dealer tomorrow and see what the ones they sell with the lift avg. Right now I'm at 18.2mpg
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