About the I6 vs. V8 discussion - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > About the I6 vs. V8 discussion

Rockridge 4WD IS Taking Zone Offroad Suspension Lift Kits End of Summer Sale, 20% OFF!ZONE 4.25" combo lift for TJ available at Rockridge4w

Closed Thread
Unread 05-29-2007, 01:48 PM   #1
Registered User
Join Date: Aug 2006
Location: Tecumseh, MI
Posts: 137
About the I6 vs. V8 discussion

I wasn't looking for which engine's better all around becuase I know it has been discussed A LOT of times, all I wanted to know was how big the fuel economy difference is between the I6 and the V8.

offroader156 is offline  
Unread 05-29-2007, 01:53 PM   #2
Registered User
2003 WJ 
Join Date: Jun 2005
Location: CT
Posts: 8,242
Dude theres about 4million posts about that...

The I6 does about 2mpg better on average than the V8.

03 WJ 4.7 242HD Kolak/IRO 5" Clayton LA's
35" BFGoodrich KM2
sira4x4.net North East Offroad Club
nierace is offline  
Unread 05-29-2007, 02:08 PM   #3
Registered User
2004 WJ 
Join Date: May 2006
Location: Poland, Katowice
Posts: 1,748
Mostly depends on how it's driven! If it's slowly, then I gets better mpg. But when you start to drive really aggressively, V8 will get better MPG with the same driving style, since it won't be working on high revs. It's really simple.
And there is no definite answer like "I6 will get 1,523 MPG difference with 38% of city driving..." It even depends on air temperature, height above sea level. Many, many factors!

Anyway, nothing will beat Suzuki :D
mendelmax is offline  
Unread 05-29-2007, 02:14 PM   #4
Registered User
2000 WJ 
Join Date: Mar 2007
Location: Kitchener, ON Canada
Posts: 1,021
Exactly. There is no "definitive" answer to the question.

The bottom line is if you have real concerns over a possible 2 or 3 mpg difference, you probably should be scratching the Jeep off of your list of vehicles to buy...
JG_Canuck is offline  
Unread 05-29-2007, 02:17 PM   #5
Registered User
1995 ZJ 
Join Date: Sep 2006
Location: Texas
Posts: 307
Its a freakin Jeep, mpg is going to suck no matter which engine you get.
95 zj with some big n heavy crap!
jfowlzj95 is offline  
Unread 05-29-2007, 02:18 PM   #6
Mr. Hyde!
ArloGuthroJeep's Avatar
2004 WJ 
Join Date: Mar 2005
Location: Boulder, CO
Posts: 23,082
Stock they are nearly identical. Lift it and throw bigger tires on there and the V8 will generally do better because it doesn't have to work as hard as the poor tiny I6.

No more V8/I6 threads
'04 WJ, 6" Clayton LA's, 242 SYE, 35" BFG MT KM2's, 4.56 gears, & D44a locked
'14 WK2 Limited w/5.7L, ORAI, & Tow Package
ArloGuthroJeep is offline  
Closed Thread
Thread Tools

Suggested Threads

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.