So i got this problem. I used to average around 15-16 mpg city in my xj, but this last week or two i have been averaging around 10-12 mpg city. so could anyone tell me something that could be going on to cause this? and could you also tell me what your average mpg is. Thanks guys
I think we are all suffering from the same. The mileage on my XJ has dropped from around 17 to 12 mpg which is driving me crazy. No CEL light whatsoever and everything seems to be ok, but I guess that our problem is that ďwinter blend gasĒ
So for this time letís not blame our XJís!!!
01 xj limited
ZJ rear disc brakes with working parking brake
Electric fan conversion with spal fan controller
I had been getting about 11-13 MPGs on Chicago's blend. I filled up a week after moving and got 16 MPG on the first tank. A few weeks later I did a basic tune-up and I've been getting a pretty consistent 19-20 in mixed driving and about 23 on highway trips. Its all in the blend.
Yup, mine has nose-dived in the past couple weeks as well, as it does every winter. I'm sure due to running winter blend, truck doesn't heat up as quickly in colder weather so spends longer time running rich, may keep ideling longer for heat, tire pressue goes down, etc., etc.
'94 Cherokee Country Engine: 4.0 HO, Sealed canister filter, 3 core CSF steel radiator, CatCo cat, Dynomax Turbo Flow muffler. Electronics: Remote start/locks, Pioneer DEH-P7800MP w/XM, Polk Audio speakers, Garmin Nuvi 660 GPS, Cobra 148 GTL P&T w/Wilson 1000. Suspension: Old Man Emu 3" lift+OME AAL, JKS adjustable trackbar, QDs, LCAs UCAs, A.C.O.S., DPG Offroad adjustable bumpstop plate, Daystar poly bumpstops. Steering: Currie HD steering, C-ROK steering box reinforcement, OME stabilizer. Armor/Recovery: T&T Custom belly skid, Mopar gas tank skid, JKS LCA mini skids, Rock Lizard Super Skink Sliders, Mopar 2" receiver, ARB Bull Bar/Ramsey REP 8.5 winch. Drive train: D30 front axle w/Superior Chromo D30 axles & outter seals, D/S 4.56 R&P, ARB locker, Ruff Stuff cover. Ford 8.8 rear axle w/Superior Super 88 kit, Ford Motor Sports 4.56 R&P, ARB locker, SOLID cover, Russell stainless lines. Front and rear Tom Woods HD drive shafts, 242 x-fer case w/Tom Woods SYE. Tires/Wheels: 33x10.5x15 BFG Mud Terrains on Alcoas. Misc: Garvin Wilderness rack, Safari Snorkel, Redline Tuning hood lifts. Awaiting installation: Autometer A pillar gauge pod, oil, water, & tranny temp guages, PIAA driving lights, Goferit tie-rod flip bushing, '95 Brake booster and M/C, M.O.R.E. Motor mounts, TnT Custom 1.5" Shackle. Stroker Project: HO Block, '99 intake manifold, bored TB, 1" TB spacer, Dynomax Blackjack Header, Permacool electric fan.
I think we are all suffering from the same. The mileage on my XJ has dropped from around 17 to 12 mpg which is driving me crazy. No CEL light whatsoever and everything seems to be ok, but I guess that our problem is that ďwinter blend gasĒ So for this time letís not blame our XJís!!!
haha yeah man for once its not the xj's fault
99 XJ-3.5" Rubicon Express, 31" Duratracs, Black Rock wheels, Bushwacker Flares, Camo Headliner
I had no idea that the blend of gas could play such a roll in MPG. Mine is doing the same thing. I thought that something may have been wrong with the XJ, because I had just recently changed the oil, air filter, replaced the PCV hose, and ran some fuel injector cleaner through it and then the loss of MPG.
I wonder if it might help to disconnect the battery, and wipe the computer memory. Maybe it would help to let the computer relearn its' optimum settings. Don't know for sure, but it doesn't cost anything to try it.