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Old 02-09-2011, 03:29 PM   #31
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This is COMPLETELY CRAZY but if u actually want MUCH better gas mileage. You get a set of boat tires and put it on the jeep. The truck will basically become a low rider and i dont know how it would handle. But do to the super small tire circumfrance it would give u very nice gas mileage. I will probably try it this summer if i get bored. Since the tires are pritty narrow i would just be careful with them

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Old 02-09-2011, 06:22 PM   #32
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I don't know if this is completely true or not, but it seems to me that a super small tire is going to put you at crazy high RPMs compared to a taller tire. You might get better mileage in town since it takes less power to get you going, but on the highway it would be like having higher gears and your RPMs would be too high to get good mileage. I could be wrong though.

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Old 02-09-2011, 06:41 PM   #33
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hmm on my truck with the 456s i run 3k rpm at 60-65 mph.
The thing about that is there will be less power needed to get to the speed so the RPM should be lower and the truck will be like a little race car
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Old 02-09-2011, 08:36 PM   #34
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Originally Posted by flatline View Post
what gears are you running? regearing is usually needed when running bigger tires so the engine doesn't work as hard. friend with a 4 cyl gets over 18mpg with 35's. as long as he stays light on the throttle.
I have to agree, I currently have 35" tires on a 91 YJ with stock gears... Not only does it go through gas like crazy but it has no top end power (5th gear is useless) I made the decision to upgrade to 4.56 gears to bring my YJ back to a "factory like" feel.. Although I haven't yet seen the evidence with my own eyes, after a lot of research on this I have found that not only will I get the power back that I lost from the tire upgrade, I will also get slightly better gas mileage because the engine will not be working as hard to move the jeep...
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Old 02-09-2011, 08:51 PM   #35
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29" tires aired up to max psi and drive like a little old lady. I'll stick with my 35"s at 20 psi and live with 14-16 mpgs when it's tuned in, 10 mpg when it's not. I have a chevy 1 ton 4x4 grossin 12K+ that gets better milage. Love that Duramax.
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Old 02-09-2011, 11:00 PM   #36
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Originally Posted by Pingjockey View Post
I have to agree, I currently have 35" tires on a 91 YJ with stock gears... Not only does it go through gas like crazy but it has no top end power (5th gear is useless) I made the decision to upgrade to 4.56 gears to bring my YJ back to a "factory like" feel.. Although I haven't yet seen the evidence with my own eyes, after a lot of research on this I have found that not only will I get the power back that I lost from the tire upgrade, I will also get slightly better gas mileage because the engine will not be working as hard to move the jeep...
it wont be working as hard at low end. but at top end it will rev at a higher rpm. 60 is 3k rpm and 65+ is 3.5k rpm witch kills gas mileage a bit.
i got 456 and i get 11 mpg. but i also have super heavy rims and tires so when i get bored and change rims/tires wit my friend i get up to like 15
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Old 02-10-2011, 12:05 AM   #37
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Originally Posted by 89JEEPYJ View Post
it wont be working as hard at low end. but at top end it will rev at a higher rpm. 60 is 3k rpm and 65+ is 3.5k rpm witch kills gas mileage a bit.
i got 456 and i get 11 mpg. but i also have super heavy rims and tires so when i get bored and change rims/tires wit my friend i get up to like 15
I was thinking about 4.88s. Quadratec has a chart that shows the 4.88s at 2600 rpm with 35"s and a 5 spd going 65 mph. 24-26 hundred rpm is where my 4.0 likes to run. Did I read the chart wrong?
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Old 02-21-2011, 01:35 AM   #38
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Do a diesel swap and run veggie oil!!! Almost free fuel (except cost to actually refine it, pick-up fee's, etc etc...)... Save fuel, the world, and smell like french fries!!! That's a triple win!
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Old 02-23-2011, 06:34 PM   #39
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I have a huge problem!!!!!!

Okay guys, i have been reading alot and i have the feeling my jeep isn't performing properly. My MPG is very horrible it's 13 - 14 MPG. I have 31 inch tires, very heavy bumper with a windch i would saw weighs around 3 - 4 hundred pounds. I also don't drive fast max 60 mph. I drive normal only a couple times I speed. on streets i'm always driving 35 mph in 3rd gear and i don't use 5th gear. I have a flowmaster series 44 muffler, and the muffler piping ends right under neith the passenger side seat. I don't have the piping that extends to the rear. Also it's a 4.0L High output recent oil change, engine has 223k miles, recently tuned engine, and rebuilt tranny. gears should be the regular best performance one, i believe 3.57 or something close to this.

Question - What type of gas should I use? 87, 89, 91? Chevron, Shell, Arco?

Question - What type of spark plugs?

Question - What can i do to have the best fuel economy for my jeep? Recommendations please be specific, like brown gas kit what is that?
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Old 02-23-2011, 09:25 PM   #40
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Thats what the new gas is going to be like from now on.Last summer I was getting 17mpg after they pushed the E-10 on us I get 11 to 13 mpg.but it dose seem to run a little better.
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Old 02-24-2011, 02:56 AM   #41
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Originally Posted by jeepgazan View Post
Okay guys, i have been reading alot and i have the feeling my jeep isn't performing properly. My MPG is very horrible it's 13 - 14 MPG. I have 31 inch tires, very heavy bumper with a windch i would saw weighs around 3 - 4 hundred pounds. I also don't drive fast max 60 mph. I drive normal only a couple times I speed. on streets i'm always driving 35 mph in 3rd gear and i don't use 5th gear. I have a flowmaster series 44 muffler, and the muffler piping ends right under neith the passenger side seat. I don't have the piping that extends to the rear. Also it's a 4.0L High output recent oil change, engine has 223k miles, recently tuned engine, and rebuilt tranny. gears should be the regular best performance one, i believe 3.57 or something close to this.

Question - What type of gas should I use? 87, 89, 91? Chevron, Shell, Arco?

Question - What type of spark plugs?

Question - What can i do to have the best fuel economy for my jeep? Recommendations please be specific, like brown gas kit what is that?
87 gas of your choice. Your jeep will not care what brand.

Stick with the factory plugs, Champion. The fancy ones will only cost more and give you nothing extra.

13-14 is what you get with a 4.0 with mixed driving(city/highway) and that is with a light foot
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Old 02-24-2011, 03:09 AM   #42
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Do like I did. Give up on mpg and go with the job of adding 5 gal to your gas tank. I can go 300 miles now with out having to fill up. It's free and takes 30-45 minutes
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Old 02-24-2011, 09:17 AM   #43
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Or convert to diesel fantastic gas mileage
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Old 02-24-2011, 10:18 AM   #44
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Quote:
Originally Posted by schnutzy View Post
the best way to get maximum millage out of your jeep(or any other vehicle for that matter) is simply to make sure its running at 100%. this means keeping up on all maintenance, tune ups etc. make sure you use products that work well with your engine, ex: some spark plugs work great in jeeps, while others can cause the jeep to throw a fit. its all about keeping the engine running at its best and most efficient. now this is a jeep, so you are not gona get amazing millage, but just keeping it running right will give you the best results.
now some people will say that running synthetic oil and such will net you better millage, but so far i havent seen that switching back and forth with it in our vehicles. the main reason i like it is cause of the longer times between changes.
so basically just make sure everything is running good, and everything is lubed/greased/oiled up. add friction will hurt your millage.

me and my girl friends jeeps have 4.0 and i have a 4" lift with 33s and she has no lift with 29s and i was geting better gas millage onece we did the tune up spark plugs injectors and all the other stuff it jumped up right away !
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Old 04-26-2011, 07:58 PM   #45
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Don't know what you guys are talking about; I got 48 MPG in my 3.8l 2008 JK when I had it (of course I just reset the MPG gauge, and was coasting downhill on a 12 mile mountain road, but hey-who needs to be particular? )
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Old 04-26-2011, 08:57 PM   #46
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Don't know what you guys are talking about; I got 48 MPG in my 3.8l 2008 JK when I had it (of course I just reset the MPG gauge, and was coasting downhill on a 12 mile mountain road, but hey-who needs to be particular? )
That is the reason they got rid of the 4.0 6I - it couldn't comply with new regulation.
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Old 03-12-2012, 11:42 AM   #47
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I think I get 12-14. I'm in a 89 sahara 4" lift with 33's. The only way to get 30 mpg is to swap to a 2 cylinder diesel. Actually not a bad idea because you can convert that to run on waste oil...
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Old 03-12-2012, 12:02 PM   #48
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I did a complete Royal Purple Fluid swap and it netted me 2mpg out of my 350sbc Wrangler. Less resistance = less gas use. Unforntunately for us they have not come out with the 33inch free rolling tire!
Driving habits are the biggest factor in gas ussage. My grandfather [rip] could get 30mpg out of a car I only got 20mpg out of. Here was his advice:
Begin to slow down as soon as you see your need to stop ahead, less actual stopping saves gas.
Take your time and Don't race from a stop, especially if you know another stop is coming.
And even though its illegal in this state, don't shut off the car for a stop less than 5 mins. I'm not sure if this one makes such a huge difference anymore, carb. engines used a lot more gas to start then todays Fuel Injected.
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Old 03-13-2012, 09:01 AM   #49
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Oops. I meant to say a 2 LITER diesel, not a 2 cylinder haha
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Old 04-24-2012, 11:52 PM   #50
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YJ better gas milage

Hello i have a few tips for better mpg ,when you get on the eway you could find the first semi / big truck and tuck in behind it (drafting) the closer you follow it the better mpg you will get . When driving in the city try timing the lights so you dont have to come to a complete stop and coast as much as possible down hills and approaching a stop / red light ect. never stomp on the gas always take off slow and steady not to mention make sure tires are properly inflated and engine is tuned up. If you follw these tricks and tips they will def help your mpg.(following other vehicles to closely can be dangerous and illegal therefor do so at your own risk)
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Old 04-25-2012, 09:01 AM   #51
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My first wrangler, I bought new back in 95. It was the 2.5 with the 5 speed manual. I was broke and doing hypermiling before it was called that. The best tank I think I got was in the low 20's. The problem is our Jeeps are shaped like a brick. That same motor in another car could get mid 30's. Lifting and bigger tires means even more drag (that re-gearing can't fix).

A diesel swap could help, but I'd have my doubts if anyone got past the mid 30's, so you have to think about how much money you'd have to spend and how long it would take you to recover it.
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Old 04-25-2012, 10:08 AM   #52
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I get 18.5 to 20 depending on how I drive, with a stock suspension and 30x9.5/15 tires.

This summer I will lift it 2.5" and run 31s. I hope to average 16-17 after that with stock 4.10 gears. I want to drive a Jeep and I knew MPG would suck when I bought it.
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Old 04-25-2012, 05:05 PM   #53
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this thread has been around some years, ha ha ha.

i got 9mpg with my favorite carburetor on my 4.5 with auto trans. i got 10-11 with a weber 34 (but no power). i got 11-12 with any mc2100/2150 i tried (but no power either). i now have a 450cfm holley four barrel and on this tank i got 12.9mpg for all city driving. this is on stock height, 225 size tires, no heavy bumpers, no nothing, just a stock looking jeep.

hit the fuelly link and you can see what i have gotten over hte last 4k miles. it shows the different carbs and the different mileages i have gotten. it shows the highway trips and the all city trips.

https://www.fuelly.com/driver/busema...ler?fu=2529452
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Old 04-25-2012, 09:58 PM   #54
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I just swapped from 2.5 to 4.0. I have a manual tranny.no lift 31s.I average the same gas mileage.with 4.10 gears.heavy foot,16. Light foot 18 MPG.it gets better than my 14 MPG f150 I had.by the way that's mixed driving,half city half hwy.mine is a dd
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Old 04-25-2012, 10:01 PM   #55
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Oh when I swaped from 29s to 31s my mileage went down to 12mpg till I changed the speed gear.that just dont effect your speed it effects your odometer too
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Old 05-03-2012, 01:59 PM   #56
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how are you guys with the 4.2 getting 16? i feel that mine runs good... but i only get around 8 on a good day... any suggestions? I am running factory gears with 32's so i know that doesnt help but at one point it was gettin like 14 with the same setup..and it only has a 2in lift
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Old 05-03-2012, 04:02 PM   #57
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several aspects to better mileage

1. Yes, the Jeep IS shaped like a brick. Aerodynamics start to take significant effect at about 50mph. Hold the speed to below 55 mph, 50 is better for mileage.

2. Keep the rpm's up into the power band (2,000 - 3,000).

3. don't jackrabbit the starts and avoid the brakes as much as possible. If you can avoid braking you will not spend all that energy you spent getting there.

4. of course, maintenance and all that too.

5. avoid short drives. Try to combine trips so you don't need to start a cold engine.

6. buy the lowest octane gas that won't ping. The higher octane fuels require a higher operating temperature/flash point. That means that they won't put out as much energy if ignited below the flash point. The most efficient is if the spark plug fires the fuel a microsecond before it compression ingites (diesels).
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Old 05-03-2012, 04:27 PM   #58
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how are you guys with the 4.2 getting 16? i feel that mine runs good... but i only get around 8 on a good day... any suggestions? I am running factory gears with 32's so i know that doesnt help but at one point it was gettin like 14 with the same setup..and it only has a 2in lift

i have no idea man, i haven;t gotten close to that except on the highway from north texas driving down to south texas. i was also going down in elevation the whole time. i got something like 14mpg

-=-------------------------------------------

2. Keep the rpm's up into the power band (2,000 - 3,000).

for this comment, in an automatic jeep with stock tires, 3k rpm is about 79mph and it drinks gas like a drunk college girl drinks alcohol.
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Old 05-03-2012, 05:46 PM   #59
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haha, my 91 gets me about 200 miles to a tank of gas on the 2.5 with 35 tires and 4.88 gears, i traded my 2000 f 150 5.4 v8 for it and it was a 25 gallon tank and on a good week was 250 miles to a tank of gas.. but not im happy as could be with this mpg...and i live 5 miles from work so thats a plus too
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Old 05-03-2012, 05:50 PM   #60
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I was thinking about 4.88s. Quadratec has a chart that shows the 4.88s at 2600 rpm with 35"s and a 5 spd going 65 mph. 24-26 hundred rpm is where my 4.0 likes to run. Did I read the chart wrong?
at 55 mph mine is hittting around 2400rpm

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