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 MPG Zone


Notices

Dodge Ram MPG Zone Discuss your MPG woes and helpful hints here!


Latest Vendor News
AutoAnything
Addictive Desert Designs!
Bayou Goat Mounts

Reply
 
Thread Tools
  #1  
Old 04-08-2014, 11:33 AM
finn5033's Avatar
finn5033 finn5033 is offline
Dodge Ram Forum Senior Member!
 
Join Date: Dec 2013
Location: MN
Posts: 753
Gender: Male
Vehicle: 2014 Ram 1500 cc 4x4
Trim Level: Outdoorsman
Color: Granite
Engine: 2013-20?? 220ci (3.6L) Pentastar 305hp 269lb/ft
Rep Power: 0
Rep:24
finn5033 is on a distinguished road
Default Effect of wheel/tire weight increase

My trucks stock wheel/tire weight was 77lbs. If I increase that to 84 lbs how much should I expect my mpg to decrease? Both tires are A/T's so there shouldn't be any difference there. Any help would be appreciated. Thank you.

Last edited by finn5033; 04-08-2014 at 12:15 PM.
Reply With Quote
Sponsored links
  #2  
Old 04-08-2014, 12:44 PM
Hemi HFE Hemi HFE is offline
Dodge Ram Forum Senior Member!
 
Join Date: Dec 2013
Location: Michigan's Upper Peninsula (frosty nights!)
Posts: 244
Gender: Male
Vehicle: 2013 Ram 1500 HFE
Trim Level: SLT / HFE
Color: White w/ brown&beige interior
Engine: 2013-20?? 220ci (3.6L) Pentastar 305hp 269lb/ft
Rep Power: 0
Rep:10
Hemi HFE is on a distinguished road
Default

there are a lot of factors here, and you provided very little information;

If the Only change was an increase in wheel/tire weight,
Then you will see a insignificant -> slight 0.1-0.2 mpg decrease in City FE,
with negligible/no impact on Highway FE.

But,
If you change tire height (outside diameter or revs/mile) then yuo change the gearing, and height (which impacts aero).

If you change the tire width, then you change the frontal area (aero).

If you change tire model, brand, 'tread style', or even load rating (P -> LT), you change the tire's rolling resistance.

Even changing the wheel 'style' will change aero...

etc.

These are all small, nearly insignificant changes, but they can add up..

And typically when you switch from OE to 'larger' you Worsen every one of these -
(except for the gearing) ...

Then you get posts like "lost 1.5 mpg with tire change ! WTF?"
__________________
rear cam, Bluetooth/5.0, single CD, tow hooks, rear slider, bedliner, brake controller, IV hitch
Reply With Quote
  #3  
Old 04-08-2014, 12:50 PM
finn5033's Avatar
finn5033 finn5033 is offline
Dodge Ram Forum Senior Member!
 
Join Date: Dec 2013
Location: MN
Posts: 753
Gender: Male
Vehicle: 2014 Ram 1500 cc 4x4
Trim Level: Outdoorsman
Color: Granite
Engine: 2013-20?? 220ci (3.6L) Pentastar 305hp 269lb/ft
Rep Power: 0
Rep:24
finn5033 is on a distinguished road
Default

Ok here is all the info. I had the stock 17x7 aluminum wheels with the stock size 265/70/17 goodyear wrangler silent armour tires 10ply. I went to a 20x9 wheel with stock size 275/60/20 falken rocky mountain A/T tires 6ply. My aftermark et wheels weigh the same as the factory chrome clad 20's but the tires weigh 6 lbs each more than the goodyear SR-a's
Reply With Quote
  #4  
Old 04-12-2014, 01:59 PM
Juma Juma is offline
Dodge Ram Forum Senior Member!
 
Join Date: Feb 2014
Location: Northern virginia
Posts: 133
Gender: Male
Vehicle: 2014 ram crew cab
Trim Level: Tradesman
Color: Silver
Engine: 2013-20?? 220ci (3.6L) Pentastar 305hp 269lb/ft
Rep Power: 0
Rep:10
Juma is on a distinguished road
Default

My ruleofthumb calculus would be every pound of unsprung weight is worth 10 pounds so that's 6x10x4 equals 240 pounds more. So, I'd say about .5mpg-1mpg if everything else is equal.
Reply With Quote
  #5  
Old 04-15-2014, 03:16 PM
canadian.bacon's Avatar
canadian.bacon canadian.bacon is offline
Dodge Ram Forum Senior Member!
 
Join Date: Jul 2012
Location: Oakville, ON
Posts: 1,176
Gender: Male
Vehicle: 2014 RAM
Trim Level: SLT
Color: Deep Cherry Red
Engine: 2013-20?? 220ci (3.6L) Pentastar 305hp 269lb/ft
Rep Power: 3
Rep:121
canadian.bacon will become famous soon enoughcanadian.bacon will become famous soon enough
Default

whoa that sounds a lot....
Is the overall diameter the same?
__________________
Reply With Quote
  #6  
Old 04-15-2014, 09:44 PM
Hemi HFE Hemi HFE is offline
Dodge Ram Forum Senior Member!
 
Join Date: Dec 2013
Location: Michigan's Upper Peninsula (frosty nights!)
Posts: 244
Gender: Male
Vehicle: 2013 Ram 1500 HFE
Trim Level: SLT / HFE
Color: White w/ brown&beige interior
Engine: 2013-20?? 220ci (3.6L) Pentastar 305hp 269lb/ft
Rep Power: 0
Rep:10
Hemi HFE is on a distinguished road
Default

I believe that rule of thumb is intended for drag racing ..

I have heard another 'rule of thumb' that says 1# rotating (not quite the same as 'unsprung') = 4#
so that would be 4 x 4 x 6 = 96 #
__________________
rear cam, Bluetooth/5.0, single CD, tow hooks, rear slider, bedliner, brake controller, IV hitch
Reply With Quote
  #7  
Old 04-16-2014, 05:09 PM
Juma Juma is offline
Dodge Ram Forum Senior Member!
 
Join Date: Feb 2014
Location: Northern virginia
Posts: 133
Gender: Male
Vehicle: 2014 ram crew cab
Trim Level: Tradesman
Color: Silver
Engine: 2013-20?? 220ci (3.6L) Pentastar 305hp 269lb/ft
Rep Power: 0
Rep:10
Juma is on a distinguished road
Default

Quote:
Originally Posted by Hemi HFE View Post
I believe that rule of thumb is intended for drag racing ..

I have heard another 'rule of thumb' that says 1# rotating (not quite the same as 'unsprung') = 4#
so that would be 4 x 4 x 6 = 96 #
I should have said rotating. Unsprung really applies to road racing. Weight on wheel is like weght on a fly wheel. Matters big time. I think it's pretty certain that 20" wheels hurt gas mileage. But, mostly in town driving cause you are stopping and starting up again all the time.

Last edited by Juma; 04-17-2014 at 08:34 AM.
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 10:20 AM.


= 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