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Custom Chassis - Drive Line - Suspension - Wheels and Tires - LEVELING Discuss anything related to Custom Dodge Ram Wheels, Tires, Brakes, Suspension Mods, Chassis Mods and Tuning, Towing options, Driveline, Differentials, Sway Bars, Lowering Springs, Strut Braces, etc.


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  #11  
Old 05-12-2013, 12:03 PM
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Quote:
Originally Posted by Thet View Post
I just leveled my truck, got new rims (17x9 steelies), and added new tires (315/70R17) and now my computer is saying I'm getting about 8.8-9.2 MPG in town. I'm not driving it like an idiot, so I know it's not my foot. I know the rims and tires are heavier than my stock 20" rims/33" tires combo, but would that make THIS much of a difference? I was getting about 14 MPG in town. On the highway, my MPG goes up to about 12. I have the 3.92 gears.

Any ideas?

When will the new tuners be available for the 2013 models? I for some reason thought I remember them not being out quite yet...
You're new tires are about 4.5% larger than the old ones so that will throw the already unreliable computer off even more. As the other have said, the dealer can correct that, but im not sure how much room they have for adjustment. A tuner would fix that as well.


Quote:
Originally Posted by ADA16 View Post
Hey everyone why would correcting is speedometer help his mileage?
(I am also thinking about leveling and getting bigger tires)
Because this computer thinks that he is driving less distance than he really is. His hand calculated milage probably didn't change much, but the unreliable computer calculated fuel mileage is going to be off.
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  #12  
Old 05-12-2013, 02:10 PM
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Originally Posted by NWRQC View Post
You're new tires are about 4.5% larger than the old ones so that will throw the already unreliable computer off even more. As the other have said, the dealer can correct that, but im not sure how much room they have for adjustment. A tuner would fix that as well.




Because this computer thinks that he is driving less distance than he really is. His hand calculated milage probably didn't change much, but the unreliable computer calculated fuel mileage is going to be off.

This makes me feel a little better lol
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  #13  
Old 05-12-2013, 02:18 PM
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Bigger tires especially AT's or mudders have more rolling resistance than your OE Highway Performance tires. Then add your front end being higher into the wind and you get slightly worse gas mileage everytime. Aerodynamics my Ram brother. Plus, it's still a truck with decent mileage either way.
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  #14  
Old 05-12-2013, 04:08 PM
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Quote:
Originally Posted by Bruce E View Post
The dealer can re-calibrate for the new tires. Unfortunately they may charge a fee.
I dont think the dealer can calibrate past 33" tires....thats from what I know
But could be wrong

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Originally Posted by Grubrunner View Post
I vaguely remember reading on these boards a member saying the dealership can calibrate up to only a certain tire/wheel size.

Don't know.....
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Originally Posted by Thet View Post
I didn't go too much different... I think I went from a 33.1" to a 34.7" tire.
We sell the hypertech, and can set you up with a pretty good price to help you out
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  #15  
Old 05-12-2013, 05:03 PM
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Originally Posted by NWRQC View Post
Because this computer thinks that he is driving less distance than he really is. His hand calculated milage probably didn't change much, but the unreliable computer calculated fuel mileage is going to be off.
His hand calculated mileage will be just as far off because his odometer is showing a much shorter distance than what he is actually driving. Therefore he is using even more fuel than stock (because of the larger heavier tires) but going a much shorter distance (because his odometer is wrong).
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  #16  
Old 05-12-2013, 09:46 PM
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Quote:
Originally Posted by brandonjansen View Post
His hand calculated mileage will be just as far off because his odometer is showing a much shorter distance than what he is actually driving. Therefore he is using even more fuel than stock (because of the larger heavier tires) but going a much shorter distance (because his odometer is wrong).
True!
In my typing up of my response I was thinking corrected speedo.. You are absolutely correct though, uncorrected speedo + hand calculated will result in wrong result.
Thanks for catching that..
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  #17  
Old 05-12-2013, 11:18 PM
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I'm gonna give the dealer a call tomorrow.
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  #18  
Old 05-13-2013, 04:12 AM
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I'm gonna give the dealer a call tomorrow.
In the exact same boat but I work nights so I am never awake when the dealer is open. So if you could post up what they say it would be appreciated.
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  #19  
Old 05-13-2013, 04:34 AM
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LOL I work nights too. Shit sucks.
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  #20  
Old 05-13-2013, 07:36 AM
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Im sure those steel rims are considerably heavier and harder to roll than the factory's as well. Use gps to calculate miles traveled instead odo.
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