Miles per gallon - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 12-20-2015, 01:00 PM
Member
 
Join Date: Dec 2015
Posts: 7
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 409
jpen is on a distinguished road
Miles per gallon

I'm thinking of putting a lift and bigger tires on my 2006 jeep grand Cherokee. It has a 3.7 v6 and I'm wondering what I can expect? I'm thinking of running a 255/75-17.

Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old 12-29-2015, 11:33 PM
Member
 
Join Date: Jul 2015
Posts: 85
Thanks: 0
Thanked 5 Times in 5 Posts
Rep Power: 645
thzpcs is on a distinguished road
Re: Miles per gallon

I'd say a 2-3 MPG loss is reasonable.
Reply With Quote
  #3  
Old 01-30-2016, 02:11 AM
Member
 
Join Date: Jul 2015
Posts: 85
Thanks: 0
Thanked 5 Times in 5 Posts
Rep Power: 645
thzpcs is on a distinguished road
Re: Miles per gallon

Did you end up going ahead with it?
Reply With Quote
  #4  
Old 01-30-2016, 05:39 AM
Member
 
Join Date: Dec 2015
Posts: 7
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 409
jpen is on a distinguished road
Re: Miles per gallon

Yeah I have put a 2in lift and 255/75-17 tires. I'm getting about 12 to 12.5 miles per gallon city and maybe 15 hwy.
Reply With Quote
  #5  
Old 01-30-2016, 08:40 PM
Strongjeff's Avatar
Project Six Shooter / ROUSH Prototype Tech

My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Woodhaven, MI
Posts: 8,944
Thanks: 417
Thanked 663 Times in 595 Posts
Rep Power: 340012
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Re: Miles per gallon

Quote:
Originally Posted by jpen View Post
Yeah I have put a 2in lift and 255/75-17 tires. I'm getting about 12 to 12.5 miles per gallon city and maybe 15 hwy.
wow that's bad. id a figured you would gain a couple on the highway since the larger tire would in theory make the gearing taller, youd be turning less rpms
__________________
Reply With Quote
  #6  
Old 01-30-2016, 09:02 PM
Member
 
Join Date: Dec 2015
Posts: 7
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 409
jpen is on a distinguished road
Re: Miles per gallon

I was hoping to be getting better than I am. It looks good with the bigger tires but they also scrub on the pinch weld.
Reply With Quote
  #7  
Old 01-30-2016, 09:08 PM
Strongjeff's Avatar
Project Six Shooter / ROUSH Prototype Tech

My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Woodhaven, MI
Posts: 8,944
Thanks: 417
Thanked 663 Times in 595 Posts
Rep Power: 340012
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Quote:
Originally Posted by jpen View Post
I was hoping to be getting better than I am. It looks good with the bigger tires but they also scrub on the pinch weld.
Try a tuner like Hypertec. That may help with the mileage
__________________
Reply With Quote
  #8  
Old 01-30-2016, 09:11 PM
Member
 
Join Date: Dec 2015
Posts: 7
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 409
jpen is on a distinguished road
Re: Miles per gallon

Thanks I will look into that.
Reply With Quote
  #9  
Old 02-09-2016, 09:54 AM
NetworkTV's Avatar
Member
My Jeep: 2015 3.6L WK2
 
Join Date: Apr 2015
Posts: 833
Thanks: 3
Thanked 191 Times in 144 Posts
Rep Power: 6975
NetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond repute
Re: Miles per gallon

Quote:
Originally Posted by Strongjeff View Post
wow that's bad. id a figured you would gain a couple on the highway since the larger tire would in theory make the gearing taller, youd be turning less rpms
It doesn't actually work that way. While rotational speeds of the outer portion of the tire change, its not going to really have an impact on MPG the way you think.

In fact, larger tires have far more rolling resistance which make them very poor on gas mileage. That's why
economy cars tend to have such small and skinny tires.

Plus, when you lift a vehicle, the air resistance magnifies. A couple of inches can mean a loss of several miles per gallon.
__________________
2015 Jeep Grand Cherokee Limited
Deep Cherry Red Crystal Pearl Coat

Reply With Quote
  #10  
Old 02-09-2016, 10:04 AM
xJoshxx's Avatar
Premium Member
My Jeep: 2012 6.4L WK2
 
Join Date: Mar 2011
Location: Burlington,KY
Posts: 1,459
Thanks: 128
Thanked 156 Times in 129 Posts
Rep Power: 74149
xJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond reputexJoshxx has a reputation beyond repute
Re: Miles per gallon

What are MPG's?

All I know is SPG. Smiles Per Gallon.

Plus with gas prices being at near historic lows, who cares.
__________________
2012 Grand Cherokee SRT8
Reply With Quote
  #11  
Old 02-09-2016, 12:45 PM
Strongjeff's Avatar
Project Six Shooter / ROUSH Prototype Tech

My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Woodhaven, MI
Posts: 8,944
Thanks: 417
Thanked 663 Times in 595 Posts
Rep Power: 340012
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Quote:
Originally Posted by NetworkTV View Post
It doesn't actually work that way. While rotational speeds of the outer portion of the tire change, its not going to really have an impact on MPG the way you think.

In fact, larger tires have far more rolling resistance which make them very poor on gas mileage. That's why
economy cars tend to have such small and skinny tires.

Plus, when you lift a vehicle, the air resistance magnifies. A couple of inches can mean a loss of several miles per gallon.
I'm well aware of how it works I was only focusing on the gear reduction from a larger diameter tire in relation to engine speeds
__________________
Reply With Quote
  #12  
Old 02-10-2016, 10:42 AM
NetworkTV's Avatar
Member
My Jeep: 2015 3.6L WK2
 
Join Date: Apr 2015
Posts: 833
Thanks: 3
Thanked 191 Times in 144 Posts
Rep Power: 6975
NetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond reputeNetworkTV has a reputation beyond repute
Re: Miles per gallon

Quote:
Originally Posted by Strongjeff View Post
I'm well aware of how it works I was only focusing on the gear reduction from a larger diameter tire in relation to engine speeds
The problem is, especially on these newer "whole lotta gears" transmissions, even that doesn't always work in a positive manner.

The result can actually be RPMs that are too low, which means going heavier on the gas pedal to try to maintain power. Essentially, you start lugging the engine, which results in the need to give it more gas to get the same acceleration, especially once you get to the higher gears where there's not a lot of power at all.
__________________
2015 Jeep Grand Cherokee Limited
Deep Cherry Red Crystal Pearl Coat

Reply With Quote
Reply

Thread Tools
Display Modes

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Where to Get DEF/ How Much Per Gallon fun2drive 2014+ Jeep Grand Cherokee Ecodiesel 3.0 24 08-11-2014 09:55 AM
Miles per Gallon raptor5618 2014+ Jeep Grand Cherokee Ecodiesel 3.0 114 02-28-2014 03:33 PM
(S)Miles per gallon.... Scottina06 Grand Cherokee SRT - WK2 4 02-13-2014 01:01 PM
Miles per gallon help nickmuller Performance Modifications 21 02-24-2013 03:39 PM
post ur best miles per gallon drdlcks1 Grand Cherokee - WK 42 09-22-2010 02:24 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 08:49 AM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.