Super VXer
Just wondering what everyone on here is getting.
I have a current new low total of........9.3mpg for the last tank of mainly highway driving.....
This has been a problem of mine for a while now. My CEL will not go off for any reason. I have even installed a brand new MAF.
This all happened after power washing under the hood. With the lift and 9mpg its starting to REALLY hurt.
Last edited by JHarris1385 : 12/26/2006 at 10:16 AM
Super VXer
what size tires did you end up with? larger tires will hurt your mpg.. make sure the shop inflated them properly as well, i know that low tire pressure can destroy your gas mileage (as much as 15% i hear) also maybe have your brakes checked to make sure they arent contacting the wheel during normal driving
Super VXer
P265/75-16.....31.6'' i think
They look like they could use a little more air but not much. How much psi is too much in those?
Super VXer
The best way to figure out what pressure to run in your tires is to take a tire chalk and put a straight line across the tread. Drive a short distance and check the line. If it has wore off in the center of the tire then you have too much air. If it is wore off on the edges of the tread then you do not have enough pressure. The line should wear evenly across the entire surface of the tread.
quoted from a jeep tip guide for aftermarket tires
http://www.ajeepthing.com/tire-maintenance.html
Super VXer
I dropped three mpg after the lift. But I knew that was coming but during the lift. I also got a diag on it that assured me it was a faulty MAF sensor promising me to bump back up to near normal mpg, and clear the Check Engine Light. But $140 (MAF) + $80 (diag) later I still have piss poor mpg and a CEL...
Super VXer
id invest in a scan tool of some kind (id recommend scangauge II from tone) for 160 u get the ability to read your own codes and lots of other engine vitals
as for the mpg i dunno what to tell you.. sounds like its getting progressively worse? which would mean somethin clogged and getting more clogged.. fuel filter.. air filter.. egr.. for now id probably remove the roof rack and fairing and window deflectors if youve got them as they are just adding drag.. and sounds like until you figure the problem out u need as much aerodynamics as you can get
Super VXer
Bigger tires will surely cut the mileage down but not to the extent you have experienced. Tire pressure really seems to affect the mileage too. My original tires were always aired up to about 39-40 lbs with the tire stating like 44 lbs max if my memory is correct. My bigger Bridgestone Revo's are aired up to nearly 40 lbs too for max mpg. I suffered bad mileage a few years ago and changed out my Fuel Pressure Regulator and it raised my mileage up dramatically. Spazz suffered the same issue and changed his out too. Do a search for "Fuel Pressure Regulator" and see if any of this hits to home.Originally Posted by JHarris1385
Also a few years back (I live on a dirt road!) I found out my rear calipers weren't releasing properly (dust in caliper sliders!) resulting in the inner pads "dragging" and wearing out prematurely as well as uneven wearing on that side of the rotor. It went unnoticed because since it was both the VX didn't pull to either side of the road while driving. I'm quite sure this didn't help my mpg either!
Last edited by Jolly Roger VX'er : 12/27/2006 at 07:39 AM
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