DODGE RAM FORUM - Ram Forums and Owners Club! - Dodge Truck Forum

Go Back   DODGE RAM FORUM - Ram Forums and Owners Club! - Dodge Truck Forum > Dodge Ram Forum - Help Zone - Dodge Ram Problems, Complaints, & Solutions - Maintenance & Re > Dodge Ram Detailing and General Maintenance Forum > Fuel System


Notices

Fuel System All Fuel Discussions. MPG - Mileage - Fuel System Maintenance including Air Filter Replacement.


Latest Vendor News
AutoAnything
Addictive Desert Designs!
United Radio
Bayou Goat Mounts

Reply
 
Thread Tools
  #1  
Old 02-27-2012, 03:30 PM
frankeltj frankeltj is offline
Dodge Ram Forum Newcomer
 
Join Date: Feb 2012
Location: Indianapolis
Age: 28
Posts: 3
Gender: Male
Vehicle: 2011 Dodge ram
Trim Level: SLT
Color: White
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 0
Rep:10
frankeltj is on a distinguished road
Default MPG Computer Readout incorrect

was wondering if my mpg readout would be affected by larger rims and tires. I used to get 18 with my 265/70/17, but now it is showing 15. Could the computer just be off due to the size difference? I plan on just filling up and calculating that way, just wanted to see if anyone else had noticed this or had a quick answer. thanks
Reply With Quote
Sponsored links
  #2  
Old 02-27-2012, 03:47 PM
snrusnak's Avatar
snrusnak snrusnak is offline
Dodge Ram Forum Senior Member!
 
Join Date: Jan 2011
Location: Orlando
Age: 27
Posts: 13,388
Gender: Male
Vehicle: 2010 Dodge Ram 1500
Trim Level: SLT
Color: White
Engine: 2008-20?? 287ci (4.7L) PowerTech V8 310hp 330lb/ft
Rep Power: 12
Rep:1385
snrusnak has much to be proud ofsnrusnak has much to be proud ofsnrusnak has much to be proud ofsnrusnak has much to be proud ofsnrusnak has much to be proud ofsnrusnak has much to be proud ofsnrusnak has much to be proud ofsnrusnak has much to be proud ofsnrusnak has much to be proud ofsnrusnak has much to be proud of
Default

I'm not sure what the computer is basing the calculation on, but I'd guess the miles plays a role in the calculation, so if your tire size is changed then the pcm needs to be calibrated.
__________________
Sean

Breathing in and out is good enough for me.
Reply With Quote
  #3  
Old 02-27-2012, 03:59 PM
GTyankee's Avatar
GTyankee GTyankee is offline
Dodge Ram Forum Member

 
Join Date: Dec 2009
Location: San Diego East County, Ca
Posts: 19,082
Gender: Male
Vehicle: 2009 Dodge Ram 1500 2X4
Trim Level: quad cab SLT
Color: sunburst orange pearl
Rep Power: 20
Rep:2615
GTyankee has a reputation beyond reputeGTyankee has a reputation beyond reputeGTyankee has a reputation beyond reputeGTyankee has a reputation beyond reputeGTyankee has a reputation beyond reputeGTyankee has a reputation beyond reputeGTyankee has a reputation beyond reputeGTyankee has a reputation beyond reputeGTyankee has a reputation beyond reputeGTyankee has a reputation beyond reputeGTyankee has a reputation beyond repute
Default

On older vehicles, the calibration had to be reset
I won't swear to it, but i believe the computer tries to adjust itself on the newer vehicles

I do know that the computer is capable of learning a drivers style of driving
A friend of mine lets his teenage son drive his Ram, the computer is so confused between the 2 driving styles, nothing seems to work right
__________________
Ram 1500 SLT Quad cab, 5.7 HEMI(R) MDS VCT, 5 speed auto 545RFE, 3.55 differential gears, 18" Magnaflow muffler, EGR bug deflector, Bushwacker fender flares, customized Nfab nerf bars, CB radio, Autonet wi-fi router, custom soft tonneau cover, Line_X bedliner, DEBO Step, build date 10/15/08 a Wednesday built vehicle
Reply With Quote
  #4  
Old 02-27-2012, 09:38 PM
THasse THasse is offline
Dodge Ram Forum Senior Member!
 
Join Date: Feb 2011
Location: Nebraska
Age: 27
Posts: 220
Gender: Male
Vehicle: 2012 Ram 1500
Trim Level: Big Horn
Color: Dark Red
Engine: 2009-2012 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 0
Rep:44
THasse is on a distinguished road
Default

U need to get it re-calibrated, it should affect it. The only way that it wouldn't need to is if the way it calculates miles automatically via a radar or something. But it doesn't to my knowledge. On my 05 I had to and on any of the programmers one of the main functions is recalibrating for tire size. Leads me to believe u need to, can't think of a reason you wouldn't need to. Cost me 35 bucks at my local stealership.
__________________
Mods: Deleted Resonator, painted talgate logo, DiabloSport tune, K&N drop in. Plenty more on the way, finances permitting...
Reply With Quote
  #5  
Old 02-27-2012, 11:23 PM
CdnoilRAM's Avatar
CdnoilRAM CdnoilRAM is offline
I push the skinny pedal


 
Join Date: Jul 2009
Location: Calgary, AB, CA
Age: 31
Posts: 17,285
Gender: Male
Vehicle: 2009 Blown 349 Hemi
Trim Level: Sport - Modified
Color: Brilliant Black/Snake Skin Green
Engine: 2009-2012 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 20
Rep:3277
CdnoilRAM has a reputation beyond reputeCdnoilRAM has a reputation beyond reputeCdnoilRAM has a reputation beyond reputeCdnoilRAM has a reputation beyond reputeCdnoilRAM has a reputation beyond reputeCdnoilRAM has a reputation beyond reputeCdnoilRAM has a reputation beyond reputeCdnoilRAM has a reputation beyond reputeCdnoilRAM has a reputation beyond reputeCdnoilRAM has a reputation beyond reputeCdnoilRAM has a reputation beyond repute
Default

Larger diameter tires will affect the mileage, the same way that it will affect the speedo calibration. Other things that will affect the reading are things like idle/warm up time, plus you're engine now needs to turn a larger rotating mass, so the mpg will drop, especially if you do a lot of non-highway driving.
__________________
Sponsored by Bully's Performance
Green Mamba '09 Ram 1500 QCRB 4x4 Sport - dropped, blown, and bottle fed
Kurtis
Reply With Quote
Reply

Bookmarks

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


Advertisement






All times are GMT -4. The time now is 02:54 PM.


= Copyright RamForumZ.com a Gigathreads.com Network Site =Ad Management by RedTyger
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
vB.Sponsors


=Gigathreads Network=
CLUBS MOPAR NATION DSM GPMM MAMM JAM
DIESEL Diesel Forum      
CHEVY Chevy Camaro Forum Chevy Volt Forum    
CHRYSLER Chrysler 300C Forum      
DODGE Dodge Avenger Forum Dodge Caliber Forum Dodge Challenger Forum Dodge Charger Forum
  Dodge Circuit Forum Dodge Hornet Forum Dodge Magnum Forum Dodge Nitro Forum
  Dodge Ram Forum Dodge Dakota Forum Dodge Durango Forum Dodge Dart Forum
FORD Ford Raptor Forum Ford F150 Forum Ford F100 Forum  
JEEP Jeep Forum      
PONTIAC Pontiac G8 Forum      
SRT SRT Viper Forum SRT Cuda Forum