mikekaz1 Posted May 30, 2016 Share Posted May 30, 2016 Curious what gas mileage everyone's getting specifically with different tire/gear combos. I have a HO4.0, AW4, 3.55 and 33s and I'm averaging over 16mpg around town. Which I think is pretty good. ...But my main curiosity was I want to swap to 4.56 because I don't care for how much "pickup" I lack. Especially when heavily loaded. But just curious what everyone's combo and average is. As I don't want to potentially destroy was mildly decent mileage I am getting. Even for a decent power gain. Link to comment Share on other sites More sharing options...
64 Cheyenne Posted May 30, 2016 Share Posted May 30, 2016 88, 4.0, AX-15, 31 10 15s, 4.10s, absolutely certain speedo is correct, verified against GPS, 12 city 17 hwy. Link to comment Share on other sites More sharing options...
Marine1Texas Posted May 30, 2016 Share Posted May 30, 2016 1987 4.0 with HEI AX15 235/75r15 4x4 3.07 16 City / 21 hwy 1988 4.6 twin carb HEI AX15 225/75r15 4x4 3.07 17.5 / 22 hwy Link to comment Share on other sites More sharing options...
schardein Posted May 30, 2016 Share Posted May 30, 2016 1991 4.0 AW4 (2wd) 3.55 235/75-r15 driving mostly 50 miles daily round trip to work on country highways, occasionally around town during lunch with one or two 100 mile trips on the interstate, last six months average = 18.5 mpg. High of 19.9, low of 16.7. Link to comment Share on other sites More sharing options...
SVPete Posted May 30, 2016 Share Posted May 30, 2016 Stock 1988 with P235 tires. 25 mile round trip to work with an average speed of 35-40 mph. 20-21 mpg. Link to comment Share on other sites More sharing options...
johnj92131 Posted May 30, 2016 Share Posted May 30, 2016 1991 2 wheel drive AW4 3.55 axle 4.0 225/75 x 15 tires 15/17 mpg around town. 19-23 highway - depends on speed. Link to comment Share on other sites More sharing options...
HOrnbrod Posted May 30, 2016 Share Posted May 30, 2016 1991 2WD, AW4, 4.10 axle, 4.6 stroker, 265/75R15 tires, 13/14 mpg around town, 19-22 highway Link to comment Share on other sites More sharing options...
FrankTheDog Posted May 30, 2016 Share Posted May 30, 2016 92 ax15 4wd 3.07's 225/75/15. 17-19.5 mpg Don't really have city or highway but good stretches of 40-50 mph roads. 98 XJ ax15 with 4.10's and 31's averages 17-18.5 mpg. I wouldn't think that your mileage will get any worse. Link to comment Share on other sites More sharing options...
benjy_26 Posted May 31, 2016 Share Posted May 31, 2016 87 2wd SporTruck with a 2.5, ax4, 3.55's, 31x10.50 bfg AT's, synthetic fluids, and a 2.5" exhaust. 22mpg on the highway average, but I do keepnit at or under the speed limit and I have a stripped interior. Oh! I also have a drop in K&N from a late 90's Ram 1500 in my stock airbox. This must be good for 150 extra H-Peeez. Link to comment Share on other sites More sharing options...
outlaw star Posted May 31, 2016 Share Posted May 31, 2016 1987 SWB 2wd, 3.0L stroker (2.5L) AX4 transmission, had 3.55 open D35 on 31x10.50's. At 65-70mph was turning 3200 rpms and averaging 20mpg hwy. Have recently swapped to a D44 LSD 4.10, still testing. Sent from my LGLS770 using Tapatalk Link to comment Share on other sites More sharing options...
mikekaz1 Posted May 31, 2016 Author Share Posted May 31, 2016 hmm nobody seems too crazy of a combination but I guess for the most part everyones in the upper teens regardless of equipment. makes me also kinda wonder why I hear of XJs barely getting 10-12 mpg... maybe theyre just bad at math. Link to comment Share on other sites More sharing options...
AMCJeepMJ Posted May 31, 2016 Share Posted May 31, 2016 hmm nobody seems too crazy of a combination but I guess for the most part everyones in the upper teens regardless of equipment. makes me also kinda wonder why I hear of XJs barely getting 10-12 mpg... maybe theyre just bad at math. Or maybe they have a lead foot. I have an 87 2WD, short bed, 2.5, 4-speed, Dana 35 with whatever gears that came stock, 245/75/15 tires aired to 38 pounds (max sidewall pressure), I do some mild hypermiling in the truck with help of a homebullt lower air dam by modifying an 80's S10 air dam, four side grill slots blocked, antenna delete and passenger side mirror delete. You can see in my signature my economy; it is pretty consistent when kept at a max speed of 50, shifting early, and being light on the gas pedal. Link to comment Share on other sites More sharing options...
benjy_26 Posted May 31, 2016 Share Posted May 31, 2016 hmm nobody seems too crazy of a combination but I guess for the most part everyones in the upper teens regardless of equipment. makes me also kinda wonder why I hear of XJs barely getting 10-12 mpg... maybe theyre just bad at math. I think driving style has a lot to do with it. When I drive my brother's 95 XJ SE (2.5L, 4wd, 5 speed) I get pretty much the same mileage as I do on the MJ. His truck is running thinner wheels, smaller tires, and 4.10's, though. Link to comment Share on other sites More sharing options...
outlaw star Posted May 31, 2016 Share Posted May 31, 2016 hmm nobody seems too crazy of a combination but I guess for the most part everyones in the upper teens regardless of equipment. makes me also kinda wonder why I hear of XJs barely getting 10-12 mpg... maybe theyre just bad at math.With XJs, it's a combination of a few things I think, 1) They don't have the correct speedo gear for gear and tire size 2) Its slightly heavier vehicle 3) As you said, lead foot. Link to comment Share on other sites More sharing options...
Rockfrog Posted May 31, 2016 Share Posted May 31, 2016 My 88 Comanche is 255/75r17 with 3.07, Ba10/5 and 4.0 Renix with a few changes. Currently averaging 18 mpg but I can push 20-21 if I lay off the pedal and get my gramps on. My XJ averages a combined city/highway of around 18mpg as well. 35's, AW4, 4.56 gears, but she rarely runs the highway (and I always drive her like gramps on the highway) and sees about 16 around town, less if I get my foot into it. Speedo has been calibrated and is near dead on. On the trail it sees around 8mpg or so. Sent from my SGH-I337M using Tapatalk Link to comment Share on other sites More sharing options...
Jeepman Posted June 1, 2016 Share Posted June 1, 2016 I guess I am the Exception... 4.0L Stroker to 4.7L (needs more tuning) AW4 (custom lowered stall converter) 3:73 gears 35" MT MTZ's Header and full 2.5" mandrel Exhaust Truck weighs in just over 4200lbs with me and a full tank I try to baby it but its too much fun not to so my AVG is 10-13MPG city, HWY I do baby it but haven't gone on a long enough HWY drive to test what it is... Link to comment Share on other sites More sharing options...
HOrnbrod Posted June 1, 2016 Share Posted June 1, 2016 AW4 (custom lowered stall converter) :hijack: Tell us more................... Link to comment Share on other sites More sharing options...
Eagle Posted June 1, 2016 Share Posted June 1, 2016 Curious what gas mileage everyone's getting specifically with different tire/gear combos. I have a HO4.0, AW4, 3.55 and 33s and I'm averaging over 16mpg around town. Which I think is pretty good. Has your speedometer/odometer been corrected for the larger tires? Link to comment Share on other sites More sharing options...
Blue88Comanche Posted June 1, 2016 Share Posted June 1, 2016 1988 4.0, AX-15,NP242 (Full Time 4WD), 4.11 Gears, 31 tires. Combined MPG of 15, with or without the boat. best MPG was 21 back when i still had 3.07s on the interstate Link to comment Share on other sites More sharing options...
Blue XJ Posted June 1, 2016 Share Posted June 1, 2016 1988, 4.7 Renix based stroker, AW4, 4.56's, 32" Bfg Muds - 14/19 city/highway Same combo with 35" Truxus MT's - 12/16 Same combo with 35" BFG Muds - 13/17 Same results with the 35's after switching to an AX15. Link to comment Share on other sites More sharing options...
Jeepman Posted June 1, 2016 Share Posted June 1, 2016 AW4 (custom lowered stall converter) :hijack: Tell us more................... Not much to tell really but between 80-100KPH (roughly 50-65MPH)I am rev-ing around 1400-1500RPM and the factory stall speed is 1800-2000RPM so I would have to manually downshift to 3rd to get the RPM's up because I didn't like stressing the stock converter so I had a custom converter made that dropped my stall speed to around 1500RPM (what it is exactly I can't say because they couldn't be sure and said it would be 300-500RPM less then stock) but I think I need a little lower cuz I am just at the 1400-1500RPM however I think I will be better once the supercharger goes on but that's just a theory and won't know till I get around to it as I have been very lazy about it due to still wanting to keep the AC that I have never charged up yet... So far I am pleased with it and have a little more pedal power at a lower RPM instead of always revin up to move but I would rather that then too tall a gear and always reving high... Link to comment Share on other sites More sharing options...
HOrnbrod Posted June 1, 2016 Share Posted June 1, 2016 Thanks, sounds like I could use one too. I've played around with the throttle valve cable and it seems to help a bit. Gotta ask, you're not in the "Comfort" mode are you? The reason is that even though the dash switch is in the Power mode, if the switch is open - not working - it defaults to the Comfort mode. Link to comment Share on other sites More sharing options...
Jeepman Posted June 1, 2016 Share Posted June 1, 2016 Thanks, sounds like I could use one too. I've played around with the throttle valve cable and it seems to help a bit. Gotta ask, you're not in the "Comfort" mode are you? I am 97+ everything so I don't have the old Comfort/Power switch Link to comment Share on other sites More sharing options...
HOrnbrod Posted June 2, 2016 Share Posted June 2, 2016 Thanks, sounds like I could use one too. I've played around with the throttle valve cable and it seems to help a bit. Gotta ask, you're not in the "Comfort" mode are you? I am 97+ everything so I don't have the old Comfort/Power switch :thumbsup: Link to comment Share on other sites More sharing options...
mikekaz1 Posted June 4, 2016 Author Share Posted June 4, 2016 Curious what gas mileage everyone's getting specifically with different tire/gear combos. I have a HO4.0, AW4, 3.55 and 33s and I'm averaging over 16mpg around town. Which I think is pretty good. Has your speedometer/odometer been corrected for the larger tires? I swapped it, but it's not perfect still. Its near exactly 10% off (reads slower/lower then actual) so please correct me if I'm wrong. But if my odo is reporting say 160 miles and I've used 10 gal I'm getting 16mpg. Now that reading is (roughly) 10% less so I really drove aprox 176 miles. While still only burning 10 gal. So my true value is closer to 18mpg. Link to comment Share on other sites More sharing options...
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