gas mileage?

[STERLING STINGER]

is 335 miles per tank average for my 88?

[87Warrior]

is 335 miles per tank average for my 88?

per how many gallons at fill up?

[STERLING STINGER]

It was so low i was scared to drive it one mile to the station. I'm not sure how many gallons are in the tank tho. Its stock

[Geonovast]

How to check your mileage...

 

Fill up until the pump stops itself.

 

Hit tripometer, or write down odometer reading.

 

Drive around for awhile, I usually get it down to about 1/4-1/2 tank.

 

Fill up again (preferably at the exact same pump).

 

Divide number of miles since the first fill up by the number of gallons put in on the second fill up.

 

That's your MPG.

[jimoshel]

Alternate method.

Fill up at station. Drive in a straight line until you run out and stop. Place pedometer on shoe top. Walk back to station carrying gas can. Divide number of gallons into figure shown on pedometer. That's your MPG. :huh???:

[Geonovast]

Jim, why you always gotta show me up and tell the easy way?

[dakal]

hahaahaahahahaha

[STERLING STINGER]

I was just asking if my average is good. I guess ill check it on next fill up.

This sites becoming very frustrating

[75sv1]

I can remeber if the gas tank holds 17 or 23 gal. I think 23 gal. So, I divided 335/23 and it was 14 miles per gallon. Now a few things. First yours is an auto, they usually get 2-3 mpg less than a manual. Next yours is an HO. I think they get a bit less than a Renix. Next it depends on what type of driving, city, country, highway. Also, lifts and big tires cut into your mpg. Especially if you don't regear. Also, those hills in PA cost you mileage. There is a benifit to live in a (semi)flatland state line IN. That's besides the taxes.

If city for your vehicle, that would probably be fairly good. If it is all highway miles, then it probably should be 18 to 20 mpg.

I'd do what the others have told you. Fill tank, set trip odometer to '000'. Drive to 1/4 tank. Fill up. Record gallons needed to fill up. Record miles on trip Odo. Divide miles by gallons = mpg. Keep a recorod of several tankfuls.

Tom

[87Warrior]

I never drove more than 200 miles between fill ups since my gas gauge was broken :doh:

[Backroads]

My gas gauge doesnt seem to be 100% correct, and I havent filled up a jerry can to really run it dry. But with 5 speed and a 4 banger, with filling up from around the same 'empty' point on my gauge I'm getting around 15MPGs at almost 200K.

[STERLING STINGER]

I can remeber if the gas tank holds 17 or 23 gal. I think 23 gal. So, I divided 335/23 and it was 14 miles per gallon. Now a few things. First yours is an auto, they usually get 2-3 mpg less than a manual. Next yours is an HO. I think they get a bit less than a Renix. Next it depends on what type of driving, city, country, highway. Also, lifts and big tires cut into your mpg. Especially if you don't regear. Also, those hills in PA cost you mileage. There is a benifit to live in a (semi)flatland state line IN. That's besides the taxes.

If city for your vehicle, that would probably be fairly good. If it is all highway miles, then it probably should be 18 to 20 mpg.

I'd do what the others have told you. Fill tank, set trip odometer to '000'. Drive to 1/4 tank. Fill up. Record gallons needed to fill up. Record miles on trip Odo. Divide miles by gallons = mpg. Keep a recorod of several tankfuls.

Tom

ya i know how to i was just trying to see, 24 gallons is correct. i thought i saw someone got like 600 on a tank, it musta been a four banger....and mines everything you say except a high output, thats the white one. :thumbsup: thanks for being a normal person and helping me out too :thumbsup:

[JeepcoMJ]

I can remeber if the gas tank holds 17 or 23 gal. I think 23 gal. So, I divided 335/23 and it was 14 miles per gallon. Now a few things. First yours is an auto, they usually get 2-3 mpg less than a manual. Next yours is an HO. I think they get a bit less than a Renix. Next it depends on what type of driving, city, country, highway. Also, lifts and big tires cut into your mpg. Especially if you don't regear. Also, those hills in PA cost you mileage. There is a benifit to live in a (semi)flatland state line IN. That's besides the taxes.

If city for your vehicle, that would probably be fairly good. If it is all highway miles, then it probably should be 18 to 20 mpg.

I'd do what the others have told you. Fill tank, set trip odometer to '000'. Drive to 1/4 tank. Fill up. Record gallons needed to fill up. Record miles on trip Odo. Divide miles by gallons = mpg. Keep a recorod of several tankfuls.

Tom

ya i know how to i was just trying to see, 24 gallons is correct. i thought i saw someone got like 600 on a tank, it musta been a four banger....and mines everything you say except a high output, thats the white one. :thumbsup: thanks for being a normal person and helping me out too :thumbsup:

 

 

his method is wrong.

 

you need to divide by the gallons the fill up takes. and it must be a full fill up...not half full, not 3/4 full, 100% full tank.

 

if you usually top off, you must do that every tank you try to figure out your mileage on...only way to be accurate.

 

 

4.0/auto with highway driving should net you around 19-21mpg easily if it's running right. I've gotten 24mpg.

 

 

you also can't base how good your mileage is by how many miles you went...asking "is 335 miles on my tank good" is pointless....it will differ between comanches depending on what gas tank size you had...there was no single "standard" gas tank size on a comanche. there were several, and the options of which one you have also vary between longbed and shortbed.

 

 

so, figure YOUR mileage by taking miles on tank divided by gallons at full fuel-up.

[cracker]

i thought i saw someone got like 600 on a tank, it musta been a four banger....and mines everything you say except a high output, thats the white one.

 

:huh???:

 

That was 600 kilometers, not miles. 600 Kilometers is like 370 miles or so.

[jpnjim]

I almost never squeeze more than 200 miles per tank out of any Jeep I drive.

Even the bone stock 89 2wd (auto) MJ on 30's :ack:

(fuel light is on right now with 190ish on the trip OD :ack: :ack: ).

 

When I do the math the 2wd gets 14-15MPG (tho I did break 16MPG once),

and the 4wd XJ (98 4.0L auto, 4" lift on 30's for now) gets a solid 13mpg. :ack:

[mnkyboy]

Its crazy how much peoples claimed fuel mileage varies,not just here as i see it everywhere. apparently math works differently from person to person.

 

 

seems a good running 4.0L should get between 12 and 40 mpg :hmm:

 

 

 

my family has owned 6 jeeps that i can remember,none of them broke 20MPG and two are 4cyls

[JeepcoMJ]

Its crazy how much peoples claimed fuel mileage varies,not just here as i see it everywhere. apparently math works differently from person to person.

 

 

seems a good running 4.0L should get between 12 and 40 mpg :hmm:

 

 

 

my family has owned 6 jeeps that i can remember,none of them broke 20MPG and two are 4cyls

 

it's all about how you drive them, and if tire size is optimum for your gearing.

 

 

you can yank alot of mileage out of them.

 

hell, my '87 is running a '95 H.O. setup with 8,000 on the motor. 4.0, factory reman bored .030 with a comp. cam, 2001 intake manifold, borla header, 19lb injectors, and 62mm TB. auto trans, and 4.10's with 6.5" lift and 35x12.50's.

 

I got 20mpg on it last CC outing by babying the hell out of it for the most part. with the 33's on it, I can get up to 23mpg when I'm nice.

 

I average 15-17mpg when I drive it "normal"

[mnkyboy]

i can see the right setup driven easy get into the 20s,but some peoples MPG just seems insane.

 

someone a couple weeks ago was claiming 38mpg from a 4.0L MJ on 33s with 3.07s,thats a good number for most compact economy cars

[JeepcoMJ]

i can see the right setup driven easy get into the 20s,but some peoples MPG just seems insane.

 

someone a couple weeks ago was claiming 38mpg from a 4.0L MJ on 33s with 3.07s,thats a good number for most compact economy cars

 

they lied...they probably didn't put the right speedo gear in

[mvusse]

My 87 MJ, the way it sits now, but with 235/75R15 tires on it i can get 24mpg on the highway if i stick to 60mph. Don't know around town, but mixed driving town/highway was around 17. With the 33x12.50 ATs I could get ~20 highway, 16 mixed. But with the 35x12.50 MTs I barely get 12mpg for a trip (drive ~an hour and a half on the highway, wheel a day or two, drive home). Don't know what just the highway mileage is, but I'm guessing ~17.

 

Rubber compound and tire tread can make a big difference.

 

My 1994 4.0HO/stick gets ~21mpg highway, 17 city running 235/75R15 where stock is 215/75R15. My 1996 4.0HO/auto gets ~22mpg highway at a mixture of speeds varying from 60 to 90 mph running 225/75R15 (one size smaller, stock size is the same), don't know city yet as I have only had it for a few weeks, but I did just drive it ~400 miles a few days ago. and will again tomorrow. But tomorrow I will be towing a 1700 pound trailer that is quite a bit wider than the XJ, so mileage will be out the window.

 

From my experience, the Renix engines can get better mileage if you keep the speed down. The HO engines get better mileage at higher speeds, but can't touch the best numbers.

 

No matter what, the 4.0 is not a very efficient engine. My 1984 Olds 98 with a 307 fed through a Rochester Quadrajet got better mileage than my twelve year newer multiport fuel injected Cherokee that weighs a lot less, and has a smaller displacement engine.

[xjrev10]

My 1988 Comanche, 4.0 2wd, with 213k, get 20 mpg average. I drive 65 miles per hour for 20 miles a day, also an additional 20 miles at 55 mph. I always stick to the speed limit in all my gas vehicles. My 2000 Xj with 31s, gets about 12 on a good day. My Cummins, not like it matters here, gets 22 mpg average with my foot in the throttle all the time.

[mvusse]

My 2wd XJ (1996 4.0HO/AW4) just got 21-22mpg by itself, 18-19mpg towing a 1600 pound trailer on a 930 mile round trip. That's with the cruise set at 70 mph most of the way.

[75sv1]

I can remeber if the gas tank holds 17 or 23 gal. I think 23 gal. So, I divided 335/23 and it was 14 miles per gallon. Now a few things. First yours is an auto, they usually get 2-3 mpg less than a manual. Next yours is an HO. I think they get a bit less than a Renix. Next it depends on what type of driving, city, country, highway. Also, lifts and big tires cut into your mpg. Especially if you don't regear. Also, those hills in PA cost you mileage. There is a benifit to live in a (semi)flatland state line IN. That's besides the taxes.

If city for your vehicle, that would probably be fairly good. If it is all highway miles, then it probably should be 18 to 20 mpg.

I'd do what the others have told you. Fill tank, set trip odometer to '000'. Drive to 1/4 tank. Fill up. Record gallons needed to fill up. Record miles on trip Odo. Divide miles by gallons = mpg. Keep a recorod of several tankfuls.

Tom

ya i know how to i was just trying to see, 24 gallons is correct. i thought i saw someone got like 600 on a tank, it musta been a four banger....and mines everything you say except a high output, thats the white one. :thumbsup: thanks for being a normal person and helping me out too :thumbsup:

 

 

his method is wrong.

 

you need to divide by the gallons the fill up takes. and it must be a full fill up...not half full, not 3/4 full, 100% full tank.

 

if you usually top off, you must do that every tank you try to figure out your mileage on...only way to be accurate.

 

 

4.0/auto with highway driving should net you around 19-21mpg easily if it's running right. I've gotten 24mpg.

 

 

you also can't base how good your mileage is by how many miles you went...asking "is 335 miles on my tank good" is pointless....it will differ between comanches depending on what gas tank size you had...there was no single "standard" gas tank size on a comanche. there were several, and the options of which one you have also vary between longbed and shortbed.

 

 

so, figure YOUR mileage by taking miles on tank divided by gallons at full fuel-up.

 

Uh, I think you need to reread my post 100% before you say I am wrong. I said drive till you have 1/4 of a tank. I don't want the guy running out of gas. I said fill it up. Most places I have lived, that equates to 'filling up 100%'. So record the miles driven. Then didivde by the gallons replaced.

 

Now, I don't know if a 4 cly. gets much better milage in the Comanche or Cherokee. I think it got maybe 2 more MPG on the Wranglers. Sometimes 4 cyl. are put into vehicles that weigh a bit to much for them.

Tom

[streetjeep2.5]

By filling up to first click of pump and then moving price to $.50 or $.00 for ease of ciphering (not same pump) and running until 1/4 or less and dividing miles by gallons:

My 94 XJ 4.0 4x2 auto was getting 23-24 highway.

My 87 MJ 2.5 4x2 4speed gets ... well, don't know. I don't check it. Guess I should.

My 2010 Patriot Front Wheel with 2.4 (172hp) and auto trans and packing wife, myself, dog, luggage and has under 2,000 miles on it that replaced the XJ that had 256,000 on it got 26 from Indianapolis to St. Louis last weekend. I like that!

[cracker]

I fill up every 200 miles when the guage gets low. I have 5.13 gears and 37s.