Torq_Shep Posted October 20, 2020 Share Posted October 20, 2020 My 1994 2Dr Cherokee 4wd 31" tires AX-15 got 13-15mpg before I sold it in 2012 1989 2WD Comanche 215-70-15 tires AX-15 4.0L 3.55 gears got 18-21 before I sold it in 2015 1989 2WD Comanche 235-75-15 AW4 4.0L gets 13-14mpg mostly city. However, I am sure this one needs a tune-up Link to comment Share on other sites More sharing options...
Tex06 Posted November 4, 2020 Share Posted November 4, 2020 https://www.fuelly.com/car/jeep/comanche/1992/glaser06/429321 Averaging 16.9mpg. Running 31" ATs with 3.07 stock gearing and the AX-15. Do have a camper shell though....that probably isn't helping things. Last 2 months have been 100% on the highway cruising at 70-75 mph. (150 miles round trip to work with 72 miles of interstate each way) Link to comment Share on other sites More sharing options...
Tex06 Posted November 4, 2020 Share Posted November 4, 2020 On 10/8/2020 at 10:44 PM, fiatslug87 said: Well, here's what I have from about 2 years after purchase to this year (from 37,000 to 260,000 miles), probably 98% of all fill-ups. CMNCHE1: 1990, 4.0L, AX-15, 2WD, 3.07 gears, 235/75/15 tires. From first day of purchase (from 190,000 to 245,000 miles) CMNCHE2: 1989, 4.0L, AW4, 2WD, 3.56 gears, 235/75/15 tires. What are you using to track mileage? I see you're 2WD but hitting 22+ mpg seems crazy unless it was mostly a slow cruise (35-55 mph) for a full tank. Link to comment Share on other sites More sharing options...
89 MJ Posted July 4, 2021 Author Share Posted July 4, 2021 Update: Right now, I’m averaging ~16 mpg with 4 hole injectors and the new motor. It seems to me that there is too much fuel and not enough air sometimes, so I am looking at getting a bored throttle body in the future. Link to comment Share on other sites More sharing options...
omega_rugal Posted July 6, 2021 Share Posted July 6, 2021 on gasoline mpgs were terrible, 14-15, on LPG running on the lean side, i have calculated 21-22 mpg, factoing the difference in price per liter it raises the mpg to 24-25 as if it was running on gasoline Link to comment Share on other sites More sharing options...
cruiser54 Posted July 6, 2021 Share Posted July 6, 2021 Use one of these to save gas. Link to comment Share on other sites More sharing options...
89 MJ Posted July 6, 2021 Author Share Posted July 6, 2021 27 minutes ago, cruiser54 said: Use one of these to save gas. I’m not really worried about saving gas in this truck, even for how I drive it, it gets good mileage. Link to comment Share on other sites More sharing options...
cruiser54 Posted July 6, 2021 Share Posted July 6, 2021 I know. They're no fun to drive for me if I can't step on it a fair amount of time. But, drive with a vacuum gauge and see how REALLY boring it can be. Link to comment Share on other sites More sharing options...
75sv1 Posted July 6, 2021 Share Posted July 6, 2021 On my previous post, that is 2wd for the MJ. I have two XJs. One of 32's and geared 4.10. Roughly 17.5 mpg, 4wd. I think the header is cracked, an auto. The other is 31's and 3.73, auto. I had a mixture of 17.4 to 18.3. The exhuast manifold was probably leaking. I replaced it with a header this past weekend. Still, need a tail pipe. Link to comment Share on other sites More sharing options...
omega_rugal Posted July 7, 2021 Share Posted July 7, 2021 On 7/6/2021 at 7:25 AM, cruiser54 said: I know. They're no fun to drive for me if I can't step on it a fair amount of time. But, drive with a vacuum gauge and see how REALLY boring it can be. the 4.0 has a lot of options, it can be tuned for power, torque or economiy... Link to comment Share on other sites More sharing options...
zomeizter Posted July 8, 2021 Share Posted July 8, 2021 I got 19 solid mpg from the 'manche on 31s on a regular 50 mi commute when I used to daily it, and a/c use during summer. Got 20 in the winter, experimented with premium fuel, made zero difference. The math was done from every fill-up during 12 months, no lead-foot, hippie driver... I swapped in a Volvo electric radiator fan in lieu of the clutch driven unit which may have contributed to fuel economy. Link to comment Share on other sites More sharing options...
Tex06 Posted July 9, 2021 Share Posted July 9, 2021 On 7/8/2021 at 7:30 AM, zomeizter said: I got 19 solid mpg from the 'manche on 31s on a regular 50 mi commute when I used to daily it, and a/c use during summer. Got 20 in the winter, experimented with premium fuel, made zero difference. The math was done from every fill-up during 12 months, no lead-foot, hippie driver... I swapped in a Volvo electric radiator fan in lieu of the clutch driven unit which may have contributed to fuel economy. Damn, not bad for the little GM V6. My Fiero had a 2.8L in it and I would regularly pull 28-30 mpg out of it. Link to comment Share on other sites More sharing options...
Pmcb Posted August 13, 2021 Share Posted August 13, 2021 I am only getting 11-12 mpg, highway driving. 91, 4L, automatic. 1.5" lift, 31" tires. High flow air filter. What can I do to increase mileage? Link to comment Share on other sites More sharing options...
cruiser54 Posted August 13, 2021 Share Posted August 13, 2021 https://itstillruns.com/how-to-get-better-mpg-in-vehicles-10710.html Link to comment Share on other sites More sharing options...
omega_rugal Posted August 13, 2021 Share Posted August 13, 2021 2 hours ago, Pmcb said: I am only getting 11-12 mpg, highway driving. 91, 4L, automatic. 1.5" lift, 31" tires. High flow air filter. What can I do to increase mileage? not much, lift and big tires is a bad combo for mpgs.... swap a v8 Link to comment Share on other sites More sharing options...
MiNi Beast Posted August 13, 2021 Share Posted August 13, 2021 92 ho 4.0 ax15/231 37" with 4.88s D44 front corp 14 rear 8.5" lift I was pulling 11mpg My last road trip avg speed of 55mph from Michigan to Pennsylvania. Link to comment Share on other sites More sharing options...
AZJeff Posted August 14, 2021 Share Posted August 14, 2021 4 hours ago, omega_rugal said: not much, lift and big tires is a bad combo for mpgs.... swap a v8 I have 32" tires and a 3.5 inch lift. I get about 16mph in town, and about 18-19 on the highway if I keep it at 65mph or less. However, I also have the later 4.0 with the full OBD-II control system and the last head redesign. However, when I compare it to the older XJ's I had, they really didn't do THAT much worse--maybe 1pmg Link to comment Share on other sites More sharing options...
AdroitKirby Posted August 14, 2021 Share Posted August 14, 2021 I think I was getting 8 MPG before I did anything to it Link to comment Share on other sites More sharing options...
omega_rugal Posted August 14, 2021 Share Posted August 14, 2021 12 hours ago, AZJeff said: I have 32" tires and a 3.5 inch lift. I get about 16mph in town, and about 18-19 on the highway if I keep it at 65mph or less. However, I also have the later 4.0 with the full OBD-II control system and the last head redesign. However, when I compare it to the older XJ's I had, they really didn't do THAT much worse--maybe 1pmg when someone say how do i increase my mpgs i assume they already tuned everything and are runinng stock but if we are to help then - how much extra stuff is you MJ carrying? - is your MJ as aerodinamic as a brick? - dragging brakes? which tires? - is your tranny healthy? does it shift properly? slippage? Link to comment Share on other sites More sharing options...
AZJeff Posted August 15, 2021 Share Posted August 15, 2021 12 hours ago, omega_rugal said: when someone say how do i increase my mpgs i assume they already tuned everything and are runinng stock but if we are to help then - how much extra stuff is you MJ carrying? - is your MJ as aerodinamic as a brick? - dragging brakes? which tires? - is your tranny healthy? does it shift properly? slippage? Good point. Any MJ getting down under ten mpg has some significant issues Link to comment Share on other sites More sharing options...
Crash Posted August 23, 2021 Share Posted August 23, 2021 Last trip with my MJ, was about 800 miles. Fully loaded bed, avg speed of 75mph, was 18.5mpgCurrent spec, 88, 4.0 renix, 5 spd, 3.73 gears, 32s, 3 ish inch lift. Best I've gotten was 26, so far. Sent from my SM-N950U using Tapatalk Link to comment Share on other sites More sharing options...
coheed Posted August 23, 2021 Share Posted August 23, 2021 86 with the 2.8 with the original carb, AX-5, 3.55's, 235/75r15s, lifted about and inch front and rear. 3200 mile road trip to Colorado from North Carolina with a camper top, sleeping platform, and all the necessities for 11 days I managed to average 15mpg. Link to comment Share on other sites More sharing options...
Parei_doll_ia Posted August 23, 2021 Share Posted August 23, 2021 I've been getting 15-16, but my REM showed me an O2 sensor warning and my LT was stuck at 140, so we'll see if it improves with the new NTK one I just installed Link to comment Share on other sites More sharing options...
Pete M Posted August 23, 2021 Share Posted August 23, 2021 On 8/13/2021 at 2:43 PM, Pmcb said: I am only getting 11-12 mpg, highway driving. 91, 4L, automatic. 1.5" lift, 31" tires. High flow air filter. What can I do to increase mileage? has your speedometer gear been changed out to accommodate the bigger tire diameter? Link to comment Share on other sites More sharing options...
Pmcb Posted August 23, 2021 Share Posted August 23, 2021 No I did not change the speedo at all, it reads 4 mph lower at speeds about 50. I did change plugs, wires, cat and rotor and on the highway keeping it below 65 I got 18mpg on first tank. I am checking city driving now. Link to comment Share on other sites More sharing options...
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