Fuel Economy Down 40% After LIft > Need Validation Please - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 19 (permalink) Old 02-27-2009, 09:18 AM Thread Starter
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Fuel Economy Down 40% After LIft > Need Validation Please

Hey folks,

So I lifted my truck two weeks ago and noticed no fuel economy change.......until I put the new tires on and the wheel spacers last weekend. Literally I have seen a decrease of about 40%. I am not looking at the trip or any of the numbers provided by the computer because I have not yet corrected that. It used to take me a 1/4 tank to drive from home to work and back home. Today I did the drive for the first time with the lift AND tires (not being hard on the gas at all) and it took 90% of a 1/4 tank just to drive ONE WAY

I did a ton of research before lifting and putting tires on and didn't see anyone else getting this type of decrease. So, I am looking to see what kind of numbers other folks have experience with a similar set-up as mine:

2006 Jeep Commander Limited Hemi
2.25" RR Lift
1.5" SpiderTrax Wheel Spacer
265/70/17 General Grabber at2
Everything else is stock.

Thanks a bunch in advance.
Nelson

Last edited by NewCam; 02-27-2009 at 09:25 AM.
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post #2 of 19 (permalink) Old 02-27-2009, 09:23 AM
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No such situation with mine, lost a little but certainly less that 10%.

2006 Jeep Commander Limited Hemi
2.25" RR Lift
1.5" SpiderTrax Wheel Spacer
255/75/17 BFG A/T





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2006 XK, Steel Armadillo Front Bumper w/Warn Powermate winch, Rear Bumper w/tire carrier & Super Sliders, Rhino Rack Roof Rack and Foxwing Awning, KC Lights on Steel Armadillo Light Bar, 4xGuard Rear Differential Cover, Steel Armadillo Plates.
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post #3 of 19 (permalink) Old 02-27-2009, 09:26 AM Thread Starter
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a49erFan, how many miles/km do you get on a tank?
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post #4 of 19 (permalink) Old 02-27-2009, 09:37 AM
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Quote:
Originally Posted by NewCam View Post
a49erFan, how many miles/km do you get on a tank?
I do not know, I have larger tires and never reset my speedometer, that is my next mod. I think I was getting around 18 mpg with the lift and stock tires.



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post #5 of 19 (permalink) Old 02-27-2009, 10:16 AM
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I used to keep strict records of my MPG's on my wrangler but never have done it with the XK. The computer used to keep track of it when I had stock tires but since the lift I never have had an accurate #. I will have to take not of it the next time I fill up. My computer says the average is 13.9mpg that is mostly city. Is this close to the same as others who are running 31.5"-32" tall tires?

Bright Silver 4.7L 2.25 RR/OME lift, Kumho KL71 265/70/17, Flashpaq, Lights, rack, intake, Super44, mopar skids, 4x belly guard, rear fog lights, MM9500 winch, GetLost4x4 winch mount

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post #6 of 19 (permalink) Old 02-27-2009, 10:36 AM
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im geting about 14 in town and 16-17 on highway
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post #7 of 19 (permalink) Old 02-27-2009, 11:25 AM
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You should have worse MPG with bigger tires ,,, but not that low !!!

What about the tire pressure for the new tires,, may be the stock pressure (35 psi) is not optimum for the new tires !
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post #8 of 19 (permalink) Old 02-27-2009, 11:36 AM
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one thing u have to consider is the computer programming the jeep commander has, I recently had my xk lifted with bigger tires and now my mph sucks, but I had to keep in mind the computer was reset which adjusts to ur driving habits, before the additions, I took a trip ti DC and got excellent mph and acceleration bc of my driving habits on the interstate for more than a 100miles, so now I have to start from scratch, ur gas milage will get better over time, also consider adding a CAI and new muffler
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post #9 of 19 (permalink) Old 02-27-2009, 11:58 AM
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I will be buying something (don't know which one yet) this month to take care of the speedometer/mileage issue.



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post #10 of 19 (permalink) Old 02-27-2009, 12:47 PM
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That sounds way bad. Reset your computer if you havent, check your air cleaner to ensure its good to go, and remember gas gauges always take forever to get to the 1/2 mark and then drops faster the closer you get to empty. Use a full tank and see how often you refill compared to before, and then look at adding toys...er mufflers, CAIs as it always makes you feel better knowing you have a mean sounding machine. Also you should see a mild gain in mileage.
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