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Topic Review (Newest First)
05-11-2013 09:36 PM
Fishb0wl
Quote:
Originally Posted by tigerblood View Post
also keep in mind that if you havent changed you speedometer gear(like I havent), youre actually getting more than the 130-140 miles you odometer is reading, and your speedometer reads about 7 MPH fast.
Yeah before I had 3.07s and it showed slower than I was going, now with the 4.10s it's faster. I've done the math at a few different speeds compared to a GPS and its about 15% off at any given speed so to estimate my gas mileage I take the mileage the trip odometer shows and multiply it by 0.85 to subtract the 15% difference. Seems to be close enough for now until I get around to swapping out the speedo gear. I'm thinking about upping to 35s before swapping the gear out.

Only question is if the 35s will fit once I trim the rear for TJ flares with a 4" RC lift or will I need more than that to clear the 35s with full flex.
05-11-2013 09:27 PM
wrangleryj90 I get 22 city 18 freeway in my 2.5l with 30" tires
05-11-2013 09:23 PM
reno92 Driving easy with stock tires you should see18 mpg
05-11-2013 08:18 PM
littleshroom I'm thinking about purchasing a 95 YJ, manual, 4 cylinder. It currently has a 6" lift (and gets 12-14 mpg), but I want to return the jeep to it's regular driving height and use regular tires. What kind of mileage can I expect? Most people posting either seem to have an automatic transmission, or have lifted theirs, so I'm a little bit lost. Thanks.
05-11-2013 01:36 PM
Ianbeaulieu
Quote:
Originally Posted by 0III0forlife View Post

I have the 4.2L currently on 33's and get somewhere in the neighborhood of 180 for a 20 gal tank. But i guess i should say that i have an Offenhauser intake with a Holley 390 4bbl. And to make matters worse, I very rarely keep my foot off the skinny pedal. Love to hear that throaty roar coming from the snorkel when the Holley needs lots of air cause the skinny pedal is out by the radiator!...lol
Can you post up a picture of your setup? I am in the mood to change my intake and carb on my 4.2 but not sure which one to go with, and also why kind of snorkel did you buy? I'm very interested lol
05-10-2013 07:46 PM
tigerblood also keep in mind that if you havent changed you speedometer gear(like I havent), youre actually getting more than the 130-140 miles you odometer is reading, and your speedometer reads about 7 MPH fast.
05-10-2013 07:38 PM
tigerblood
Quote:
Originally Posted by Fishb0wl View Post
I average 10-13mpg with my 4.0 auto with 33" running 4.10s

I get nervous around 130-140 miles even though my gauge shows 1/4-1/2 left. However the gauge doesn't start moving until after 80-90 miles but then drops quickly so I've got no clue if the PO did the 20 gal tank mod or if my fuel gauge is messed up lol

I've been tempted to run it until its empty and have an extra fuel can just to see how far I get.

Ive got the same drivetrain as you, and basically everything you said goes for me also, except I can run my gage down to empty before I fill up without problems. I dont have the 20 gal mod done, but according to my build sheet is came with the 20 gallon tank.
05-10-2013 05:21 PM
RednekYJ 89 2.5 4.56's 33x12.5x15....


I scored 15mpg(178miles 11.9gallons) on my last tank making short trips(10 miles or less). My tank is stock 14.5gallons so in theory 210miles should be obtainable. Ill have to test that theory one day...
05-10-2013 05:13 PM
p-nut
Quote:
Originally Posted by wrangleryj90 View Post
My guess would be about 16-18
I will be really happy if I get that much.
05-10-2013 04:29 PM
wrangleryj90
Quote:
Originally Posted by p-nut View Post
Im picking up an 89YJ with a 20 gal tank, a new chevy 350, 4" lift and 33" tires.

I don't know what gears it has.

what do you think the MPG will be? --- my guess, I will be surprised and it wont be as bad as I think.
My guess would be about 16-18
05-10-2013 04:15 PM
p-nut Im picking up an 89YJ with a 20 gal tank, a new chevy 350, 4" lift and 33" tires.

I don't know what gears it has.

what do you think the MPG will be? --- my guess, I will be surprised and it wont be as bad as I think.
05-10-2013 03:41 PM
bigb996 244 is very good mind gets less with the same motor. I do need to rebuild the carb and regear though.
05-10-2013 02:53 PM
Duckquackers I get about the same with my 2013 MOAB. Average is about 12
05-10-2013 02:40 PM
Billmummey I happen to have mustang 5.0 injectors for sale
05-10-2013 01:31 PM
AllMudd
Quote:
Originally Posted by Jeep_Monkey View Post
94, 2.5L, 5 speed manual, 31" tires, 4.56 regeared, throttle body mod, mustang fuel injectors, electric fan, mean green alternator, flokooler water pump

One of my first mods was the 15 to 20 gallon mod. So I can put a smidge over 20 gallons in if I run it dry. I did not swap out sending unit so fuel guage stays pegged high for the first 5 gallons.

Mileage varies from 12-15 mpg in town with stop and go driving, 15-18 mpg driving on the highway at 65-75 mph, to a high of 23 mpg driving easy trails / backroads around 40 mph.

Speedometer is reasonably accurate compared to gps.

Aside from different driving conditions, I find that mileage is significantly impacted by the configuration of the top and weather conditions. I have a soft top, so I have no way to compare it to hard top. Worst mileage seems to be totally topless. Full top with doors and windows is better. Running sahara mode (soft top with side and rear windows removed) is best mileage configuration for me.

Of course, wind direction can help/hurt too. Drove from dallas to austin a few weeks ago into a 20 mph headwind. Aside from feeling like I was swimming upstream, it had a big impact on mileage... About 10 mpg that trip.



Mustang injector mod? Is there a thread on this? What's the year, eng that the injectors are needed from?
05-10-2013 01:04 PM
Fishb0wl I average 10-13mpg with my 4.0 auto with 33" running 4.10s

I get nervous around 130-140 miles even though my gauge shows 1/4-1/2 left. However the gauge doesn't start moving until after 80-90 miles but then drops quickly so I've got no clue if the PO did the 20 gal tank mod or if my fuel gauge is messed up lol

I've been tempted to run it until its empty and have an extra fuel can just to see how far I get.
05-10-2013 12:35 AM
Jeep_Monkey 94, 2.5L, 5 speed manual, 31" tires, 4.56 regeared, throttle body mod, mustang fuel injectors, electric fan, mean green alternator, flokooler water pump

One of my first mods was the 15 to 20 gallon mod. So I can put a smidge over 20 gallons in if I run it dry. I did not swap out sending unit so fuel guage stays pegged high for the first 5 gallons.

Mileage varies from 12-15 mpg in town with stop and go driving, 15-18 mpg driving on the highway at 65-75 mph, to a high of 23 mpg driving easy trails / backroads around 40 mph.

Speedometer is reasonably accurate compared to gps.

Aside from different driving conditions, I find that mileage is significantly impacted by the configuration of the top and weather conditions. I have a soft top, so I have no way to compare it to hard top. Worst mileage seems to be totally topless. Full top with doors and windows is better. Running sahara mode (soft top with side and rear windows removed) is best mileage configuration for me.

Of course, wind direction can help/hurt too. Drove from dallas to austin a few weeks ago into a 20 mph headwind. Aside from feeling like I was swimming upstream, it had a big impact on mileage... About 10 mpg that trip.
05-09-2013 09:46 PM
reno92 What he said^
From what I hear 91-95 YJ's all came with 20 gallon tanks but differant filler necks and sending units that only allowed some to use 15 gallons. I read you can fix this very easy and have a full 20 gallon tank, but the sending unit will show overfull and not begin to move till the extra 5 gallons are used. Read this
Wrangler YJ Gas Tank Modification 15 to 20 Gallons
05-09-2013 09:19 PM
0III0forlife Actually if you want to get technical, they only offered 1 size of stock tank. Meaning the actual size of the fuel tank, outer dimensions, is the same. The gals that they hold would be either 15 or 20. The only difference between the 2 tanks is the length of the vent tube that goes down into the tank.

I have the 4.2L currently on 33's and get somewhere in the neighborhood of 180 for a 20 gal tank. But i guess i should say that i have an Offenhauser intake with a Holley 390 4bbl. And to make matters worse, I very rarely keep my foot off the skinny pedal. Love to hear that throaty roar coming from the snorkel when the Holley needs lots of air cause the skinny pedal is out by the radiator!...lol
05-09-2013 07:28 PM
Billmummey I wonder how many different size tanks they offered, I just put 18gal in to fill it up and when I ran out this morning I put 4 gal in and I've only gone 6 miles since I out the first 4 in it
05-09-2013 07:23 PM
sinbob I have a 19 gal tank. I usually get about 220 to 240 miles per tank. Just depends on how I am handling the skinny pedal. 4.0, 6sp on BFG 35's with 4.88's
05-09-2013 07:08 PM
Billmummey And here comes the old wise man.... Hahaha ya I need to find mine and get some way to mount them
05-09-2013 05:41 PM
Fredzo That's why we carry Jerry Cans!
05-09-2013 01:34 PM
p0larb3ar 2.5l 5spd with 31" tires on about 1.5" of lift and I always fill by 150, and I normally only put 10-11 gallons at that point. In theory I have the 15 gallon limit still on
05-09-2013 12:59 PM
GrkYJ Matt10- I'm with you, 93 4.0 manual with 31s get between 210-225 mpt. I wish I would get 300
05-09-2013 12:24 PM
Matt10 I have a 4.0 manual and I get like 210. With 31s
05-09-2013 12:20 PM
Billmummey
Quote:
Originally Posted by reno92 View Post
FYI if you have not changed your speedometer/odometer gear for those 33" tires you actually have somewhere between 270-280 miles + on that tank, not what you're showing on the odo. You should add at least 10% to your MPH and MPG's running those tires. This is assuming the speedo gear has not been changed.
I forgot about that, your righty speedo is off because of the tires so I'm probably getting better mpg than I thought
05-09-2013 11:58 AM
AllMudd
Quote:
Originally Posted by Willybusmc View Post
My 95 gets 170 miles on a tank tops. It's a 2.5

With an 11 gallon tank
I have a 95 YJ S (base model) and it has a 15 gal tank. I was unaware that they even made a smaller tank. IMO you might want to check out why you only can get 11gal at a time.
05-09-2013 11:36 AM
reno92 FYI if you have not changed your speedometer/odometer gear for those 33" tires you actually have somewhere between 270-280 miles + on that tank, not what you're showing on the odo. You should add at least 10% to your MPH and MPG's running those tires. This is assuming the speedo gear has not been changed.
05-09-2013 10:33 AM
wrangleryj90 I get 300-350 miles out of a tank with my 2.5l and 30's although I put 33's on for the trails they cost me to much to buy and hurt my gas mileage to much
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