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Unread 06-06-2014, 09:42 AM   #1
slowurroll
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Mpg drop after lift

Hey guys. I'm curious to know what you guys with lifts are experiencing with your mpgs. I got my ome hd in a couple days ago and noticed I am averaging about 12-12.5 versus the 14-15 i was before. I haven't even put my 265s on yet. Is this normal to drop that much?

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Unread 06-06-2014, 10:08 AM   #2
NotDamian
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If you took off the air dam, it will drop it at a least 1 mpg.
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Unread 06-06-2014, 10:18 AM   #3
luckyse7ens
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Quote:
Originally Posted by NotDamian View Post
If you took off the air dam, it will drop it at a least 1 mpg.
I find this hard to believe
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Unread 06-06-2014, 10:29 AM   #4
paroxysym
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Quote:
Originally Posted by slowurroll View Post
Hey guys. I'm curious to know what you guys with lifts are experiencing with your mpgs. I got my ome hd in a couple days ago and noticed I am averaging about 12-12.5 versus the 14-15 i was before. I haven't even put my 265s on yet. Is this normal to drop that much?
well you changed the aerodynamics of the vehicle so its going to drop. the addition of tires will cause another hit. done any maintenance aside from the lift lately? are you planning on adding a tuner to your jeep to adjust the speedo for the 265s? most tunes will help your gas mileage.


Quote:
Originally Posted by luckyse7ens View Post
I find this hard to believe
try it and find out... thats the concensus- you lose the airdam and you lose a bit of gas mileage.. i trimmed mine and really didnt notice a difference.
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Unread 06-06-2014, 03:42 PM   #5
slowurroll
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Quote:
Originally Posted by paroxysym
well you changed the aerodynamics of the vehicle so its going to drop. the addition of tires will cause another hit. done any maintenance aside from the lift lately? are you planning on adding a tuner to your jeep to adjust the speedo for the 265s? most tunes will help your gas mileage. try it and find out... thats the concensus- you lose the airdam and you lose a bit of gas mileage.. i trimmed mine and really didnt notice a difference.
I realize it would change but I didn't expect a 2ish mpg drop before tires went on. I haven't. Other than I'm getting an alignment as we speak. The 265s won't be on until I get back from a two week California trip. I want a tune. But I wasn't sure i wanted to fork over the cash so soon. Can the dealership do anything about adjusting the speedo when the tires go on? I've heard people say that about the air dam. I Want to remove it but haven't yet.
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Unread 06-06-2014, 06:44 PM   #6
tjkj2002
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Quote:
Originally Posted by luckyse7ens View Post
I find this hard to believe
More air passing under the vehicle since it was raised the less mpg's you wil, get.Yes IFS lifts increase ground clearance in the front even without adding larger tires.
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Unread 06-06-2014, 09:33 PM   #7
modernblueWK
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I lost 1 mpg with the strut spacer, 2 mpg when i took the airdam off. These are highway numbers. I have not adjusted the speedo for the tires. I used to average 16.5 combined now im in the 13's combined, hwy/city. Im taking a trip to Denver in a few days then 900 miles around the san juans. Curious to see how it does all highway with no airdam.
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Unread 06-07-2014, 08:24 AM   #8
twistedlizard72
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I've got a 4.7L on a Superlift and 285/70's, mileage XS tune (superchips) with air dam on and have been Averaging 15.5 (EVIC) mixed city/Hwy.
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Unread 06-07-2014, 07:54 PM   #9
slowurroll
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Hm. So it sounds like maybe i am close to expected. But I feel like I'm on the low side. Superchips tune sounds like it will be in my future then.
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Unread 06-07-2014, 09:51 PM   #10
816jared
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2005 4.7L
  • OME HD
  • airdam still on
  • superchips 91 tune
  • afe CAI
  • full magnaflow exhaust
  • tire size - 255/70/18

my commute is ~30 miles with 6-8 stoplights depending on the route I take. keep the cruise control set somewhere around 72. my EVIC always shows between 18-20mpg.
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Unread 06-08-2014, 02:25 PM   #11
slowurroll
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Damn that's not bad at all. I could go for that. Sounds like I really need to get that tune.
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Unread 07-03-2014, 05:50 AM   #12
danb303
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Did any of those add dons give you a significant gain Iin mpg? I only get 18 (everything is stock right now) on the interstate so I'm curious.



Quote:
Originally Posted by 816jared View Post
2005 4.7L
  • OME HD
  • airdam still on
  • superchips 91 tune
  • afe CAI
  • full magnaflow exhaust
  • tire size - 255/70/18

my commute is ~30 miles with 6-8 stoplights depending on the route I take. keep the cruise control set somewhere around 72. my EVIC always shows between 18-20mpg.
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Unread 07-03-2014, 06:50 AM   #13
IndyBlueWK
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Mine is awful, something like 10-11 in the city and maybe 16 on the intrstate if im lucky. 2 inch lift, "still have air dam", 265's, Dynomax Cat back, Hypertech 87 tune.


Has anyone toyed around with air dam/blocker thats behind the grill. I thought about leaving this on but went with the direct air flow theroy being better....
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Unread 07-03-2014, 07:58 AM   #14
JeepN4KC
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Quote:
Originally Posted by NotDamian View Post
If you took off the air dam, it will drop it at a least 1 mpg.


Quote:
Originally Posted by luckyse7ens View Post
I find this hard to believe
^^^ This.

Quote:
Originally Posted by tjkj2002 View Post
More air passing under the vehicle since it was raised the less mpg's you wil, get.Yes IFS lifts increase ground clearance in the front even without adding larger tires.
True........but I get a laugh when the whole airdam vs mpg thing gets brought up. The only way to honestly and accurately assign a 1mpg drop is to run the Jeep with and w/o the airdam for the exact same miles; exact same terrain; exact same rpms; exact same load; etc., etc.,

In otherwords, a controlled test if you will - not in the field.
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Unread 07-03-2014, 03:01 PM   #15
bhawks28
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I get around 14 MPG in the city driving. I can get it up to about 18 if I cruise at 55MPH on the highway. This is with 3.7L, OME HD, 255/75/17 BFG MT, K&N intake, and hypertech programmer.
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